Build(deps): Update icalendar requirement from <7.0,>=6.0.0 to >=6.0.0,<8.0

[dependabot]

Updates the requirements on icalendar to permit the latest version.

Release notes

Sourced from icalendar's releases.

v7.0.3

To view the changes, please see the Changelog. This release can be installed from PyPI.

Changelog

Sourced from icalendar's changelog.

7.0.3 (2026-03-03)

Minor changes

- Show colorful required code changes in the CI output to help contributors solve the formatting issues. :pr:`1216`
- Use ruff 0.15.0 for code formatting in :file:`tox.ini`. :pr:`1215`
New features

- Added :attr:`Event.RECURRENCE_ID <icalendar.cal.event.Event.RECURRENCE_ID>`, :attr:`Todo.RECURRENCE_ID <icalendar.cal.todo.Todo.RECURRENCE_ID>`, and :attr:`Journal.RECURRENCE_ID <icalendar.cal.journal.Journal.RECURRENCE_ID>` properties, including support in their ``new()`` constructors. :issue:`1231`
Bug fixes

- Fixed :func:`~icalendar.timezone.tzid.tzids_from_tzinfo` not recognizing
  ``dateutil.tz.win.tzwin`` objects on Windows. UTC datetimes using
  ``dateutil.tz.gettz("UTC")`` now correctly serialize with the ``Z`` suffix
  instead of ``TZID=Coordinated Universal Time``. :issue:`1056`
- Fixed :meth:`Calendar.get_missing_tzids <icalendar.cal.calendar.Calendar.get_missing_tzids>`
  raising ``KeyError`` when a VTIMEZONE exists for a timezone not referenced by any event TZID,
  for example, when added by the ``x-wr-timezone`` conversion. :issue:`1124`
- Fixed :meth:`Calendar.get_missing_tzids <icalendar.cal.calendar.Calendar.get_missing_tzids>`
  and :meth:`Calendar.add_missing_timezones <icalendar.cal.calendar.Calendar.add_missing_timezones>`
  generating a spurious ``VTIMEZONE`` for UTC. :rfc:`5545#section-3.2.19` requires UTC datetimes
  to use the ``Z`` suffix; no ``VTIMEZONE`` component is needed or permitted. :issue:`1124`
- Fixed :meth:`Parameters.update_tzid_from <icalendar.parser.parameter.Parameters.update_tzid_from>`
  incorrectly setting ``TZID=UTC`` on UTC datetimes. :rfc:`5545#section-3.2.19` requires UTC datetimes to
  use the ``Z`` suffix without a ``TZID`` parameter. :issue:`1124`
- Renamed the public functions ``escape_char`` and ``unescape_char`` to implicit private methods ``_escape_char`` and ``_unescape_char``
  Fixed regression from :issue:`1008` by restoring :func:`~icalendar.parser.string.escape_char` and :func:`~icalendar.parser.string.unescape_char` as public functions.
  The public functions :func:`~icalendar.parser.string.escape_char` and :func:`~icalendar.parser.string.unescape_char` are now deprecated with warnings for external users.
  :pr:`1241`

Documentation
</code></pre>
<ul>
<li>Add <code>icalendar</code> as a local workspace dependency to the <code>docs</code> dependency group in :file:<code>pyproject.toml</code> to fix dependency resolution issues with <code>uv lock</code> during documentation builds. :issue:<code>1253</code> :pr:<code>1254</code></li>
<li>Use <code>sphinx-icalendar</code> to add syntax highlighting to iCalendar text</li>
</ul>
<h2>7.0.2 (2026-02-24)</h2>
<p>Minor changes</p>
<pre><code>
- Show required code changes in the CI output to help contributors solve the formatting issues. :pr:`1216`
- Use ruff 0.15.0 for code formatting in :file:`tox.ini`. :pr:`1215`
</tr></table> 
</code></pre>
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>

<ul>
<li><a href="https://github.com/collective/icalendar/commit/f513590ebebe93770dd415736535e8e04e9c56c2"><code>f513590</code></a> version 7.0.3</li>
<li><a href="https://github.com/collective/icalendar/commit/5052002703013b7eb7d19435702285bcb7eba517"><code>5052002</code></a> version 7.0.3</li>
<li><a href="https://github.com/collective/icalendar/commit/c8b5a13eb36232e2fa297461d4eb676b361ee4f7"><code>c8b5a13</code></a> Merge pull request <a href="https://redirect.github.com/collective/icalendar/issues/1266">#1266</a> from collective/dependabot/github_actions/github-act...</li>
<li><a href="https://github.com/collective/icalendar/commit/7636204e0a6bee1f9b9eae223e363db248c0c8fa"><code>7636204</code></a> Bump actions/upload-artifact from 6 to 7 in the github-actions group</li>
<li><a href="https://github.com/collective/icalendar/commit/e69b61041945de340b532b9ff71bc4504d78f3e8"><code>e69b610</code></a> Merge pull request <a href="https://redirect.github.com/collective/icalendar/issues/1261">#1261</a> from collective/fix/issue-1056-tzwin-utc</li>
<li><a href="https://github.com/collective/icalendar/commit/2be65288a56474781ec5c583ade70dd6328748b8"><code>2be6528</code></a> fix: recognize dateutil tzwin objects as UTC on Windows</li>
<li><a href="https://github.com/collective/icalendar/commit/b2c57e8ed02d325c7fbbe49760c4cfa5b1456ab6"><code>b2c57e8</code></a> Merge pull request <a href="https://redirect.github.com/collective/icalendar/issues/1260">#1260</a> from collective/1245-docstrings-followup</li>
<li><a href="https://github.com/collective/icalendar/commit/f9685143f08d8f2d1c101e4c1b1e0e97af1c94af"><code>f968514</code></a> Improve markup, follow up to <a href="https://redirect.github.com/collective/icalendar/issues/1245">#1245</a></li>
<li><a href="https://github.com/collective/icalendar/commit/bb480a92f5f56fe7b088b8d4cb9aaf0d7f39b14f"><code>bb480a9</code></a> Merge pull request <a href="https://redirect.github.com/collective/icalendar/issues/1254">#1254</a> from Parth-Vasave/syntax-highlight-config</li>
<li><a href="https://github.com/collective/icalendar/commit/550cbf839297eafe871fd1c60e77d4e6c072d0fa"><code>550cbf8</code></a> Apply suggestions from code review</li>
<li>Additional commits viewable in <a href="https://github.com/collective/icalendar/compare/v6.0.0...v7.0.3">compare view</a></li>
</ul>
</details>

&lt;br /&gt;</code></pre>


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Dependabot dependency bump — reviewed and approved.