chore(deps): update Sentry Android Gradle Plugin to v6.21.0

[github-actions]

Bumps scripts/update-sentry-android-gradle-plugin.sh from 6.20.0 to 6.21.0.

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Changelog

6.21.0

Fixes

• Fix snapshot task wiring failing with InvalidUserDataException on application modules with multiple flavors (#1431)

Security

• Verify the Kotlin compiler plugin's build dependencies with PGP signatures (#1423, #1430)

Dependencies

• Bump CLI from v3.6.2 to v3.7.0 (#1428)
  • changelog
  • diff
• Bump Android SDK from v8.54.0 to v8.55.0 (#1435)
  • changelog
  • diff

[github-actions]

Semver Impact of This PR

⚪ None (no version bump detected)

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• chore(deps): update Sentry Android Gradle Plugin to v6.21.0 by github-actions[bot] in #6671

• chore(deps): Bump fast-uri to ^3.1.6 to resolve security alerts by antonis in #6662
• chore(deps): Bump qs to ^6.16.0 to resolve security alerts by antonis in #6663
• chore(deps): Bump @xmldom/xmldom pins to patched versions to resolve security alerts by antonis in #6664
• docs: Revamp root and nested AGENTS.md by antonis in #6666

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