build(deps): bump helmet from 7.2.0 to 8.3.0 in /backend

[dependabot]

Bumps helmet from 7.2.0 to 8.3.0.

Changelog

Sourced from helmet's changelog.

8.3.0 - 2026-07-11

Changed

• Content-Security-Policy: improved performance by ~7% when there are no dynamic directives
• Content-Security-Policy: improved error handling for invalid directive names

Fixed

• Content-Security-Policy: useDefaults: false with no directives is no longer valid, both at runtime and the type level
• Content-Security-Policy: dynamically-computed directive values would throw, not call next, when invalid
• Content-Security-Policy: dynamically-computed directive value entries would throw, not call next, when function threw

8.2.0 - 2026-05-21

• Cross-Origin-Opener-Policy: support noopener-allow-popups. See #522
• Improve error message when passing duplicate options

8.1.0 - 2025-03-17

Changed

• Content-Security-Policy gives a better error when a directive value, like self, should be quoted. See #482

8.0.0 - 2024-09-28

Changed

• Breaking: Strict-Transport-Security now has a max-age of 365 days, up from 180
• Breaking: Content-Security-Policy middleware now throws an error if a directive should have quotes but does not, such as self instead of 'self'. See #454
• Breaking: Content-Security-Policy's getDefaultDirectives now returns a deep copy. This only affects users who were mutating the result
• Breaking: Strict-Transport-Security now throws an error when "includeSubDomains" option is misspelled. This was previously a warning

Removed

• Breaking: Drop support for Node 16 and 17. Node 18+ is now required

Commits

• 75f1a98 8.3.0
• f03f70d Update changelog for 8.3.0 release
• a307fce Fix capitalization in CSP package changelog
• 5347b43 Format default CSP in README for readability
• 9afc570 CSP: fix middleware-specific README missing link
• 266c95c Minor speedups to project setups test
• 7a4196c CSP: update package-specific changelog
• 02716b4 CSP: improve performance when there are no dynamic directives
• 3f511ed CSP: move utility functions to separate file
• 80338af CSP: disabling defaults with no directives is now an error
• Additional commits viewable in compare view

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[sai4u-dev]

Superseded by chore/consolidated-dependabot-updates (pushed): this bump is landed there along with the Express 5 / fiber-peer / lockfile compat fixes, verified green (backend lint+tests+E2E, frontend lint+build, audit, docker images). Closing to clear the backlog — please review/merge chore/consolidated-dependabot-updates.

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