Update Slack mappings for release QA notifications (swicken, adrianjm-dotCMS)

[nollymar]

Background

The release-pipeline QA notification resolves GitHub usernames to Slack member IDs via .github/data/slack-mappings.json so flagged-PR authors get a real @-mention (see #35825 / PR #35815). Unmapped or incorrectly-mapped users fall back to plain @login and are not notified.

Changes

• Rename swicken-dotcms → swicken (actual GitHub login).
• Add adrianjm-dotCMS → U09LGQVCBLK.

Why

Both users author PRs that show up in the QA report; without correct mapping entries they don't get pinged when their PR ships without a QA verdict.

[github-actions]

PRs linked to this issue

• chore(slack-mappings): correct swicken login and add adrianjm-dotCMS by @nollymar