build(deps): bump anchore/sbom-action (#732)

Bumps the github-actions group with 1 update in the /.github/actions/bootstrap directory: [anchore/sbom-action](https://github.com/anchore/sbom-action).


Updates `anchore/sbom-action` from 0.20.11 to 0.21.0
- [Release notes](https://github.com/anchore/sbom-action/releases)
- [Changelog](https://github.com/anchore/sbom-action/blob/main/RELEASE.md)
- [Commits](anchore/sbom-action@43a17d6...a930d0a)

---
updated-dependencies:
- dependency-name: anchore/sbom-action
  dependency-version: 0.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/actions/bootstrap/action.yml

@@ -28,4 +28,4 @@ runs:
     # See https://goreleaser.com/blog/supply-chain-security/
     - name: installs syft for generating the SBOM with goreleaser
       if: "${{ inputs.goreleaser == 'true' }}"
-      uses: anchore/sbom-action/download-syft@43a17d6e7add2b5535efe4dcae9952337c479a93 # v0.20.11
+      uses: anchore/sbom-action/download-syft@a930d0ac434e3182448fe678398ba5713717112a # v0.21.0