Bump trufflesecurity/trufflehog from 3.19.0 to 3.21.0

Bumps [trufflesecurity/trufflehog](https://github.com/trufflesecurity/trufflehog) from 3.19.0 to 3.21.0.
- [Release notes](https://github.com/trufflesecurity/trufflehog/releases)
- [Changelog](https://github.com/trufflesecurity/trufflehog/blob/main/.goreleaser.yml)
- [Commits](trufflesecurity/trufflehog@v3.19.0...v3.21.0)

---
updated-dependencies:
- dependency-name: trufflesecurity/trufflehog
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/trufflehog.yml

@@ -11,7 +11,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: TruffleHog OSS
-        uses: trufflesecurity/trufflehog@v3.19.0
+        uses: trufflesecurity/trufflehog@v3.21.0
         with:
           path: ./
           base: ${{ github.event.repository.default_branch }}