chore(deps): bump helmet from 8.0.0 to 8.1.0 in /backend

[dependabot]

Bumps helmet from 8.0.0 to 8.1.0.

Changelog

Sourced from helmet's changelog.

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

Commits

• 57e1b39 8.1.0
• c8efbe3 Update changelog for 8.1.0 release
• 3396804 Add 8.0.0 release date to changelog
• 52dd8eb Content-Security-Policy: better error when value should be quoted
• 4af4777 Use built-in test runner (instead of Jest)
• ba10272 Organize imports
• e0f1387 Update devDependencies to latest versions
• 842393c Check types during npm test, run in parallel
• 77fbe3a Strict-Transport-Security: fix documentation for default max-age
• 632e629 Update license year for 2025
• See full diff in compare view

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