ci(deps): bump slsa-framework/slsa-github-generator from 1.9.0 to 2.1.0

Bumps [slsa-framework/slsa-github-generator](https://github.com/slsa-framework/slsa-github-generator) from 1.9.0 to 2.1.0.
- [Release notes](https://github.com/slsa-framework/slsa-github-generator/releases)
- [Changelog](https://github.com/slsa-framework/slsa-github-generator/blob/main/CHANGELOG.md)
- [Commits](slsa-framework/slsa-github-generator@v1.9.0...v2.1.0)

---
updated-dependencies:
- dependency-name: slsa-framework/slsa-github-generator
  dependency-version: 2.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/deploy-enhanced.yml

@@ -253,7 +253,7 @@ jobs:
           severity: 'CRITICAL,HIGH'
 
       - name: Generate SLSA Provenance
-        uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v1.9.0
+        uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v2.1.0
         with:
           image: ${{ steps.meta.outputs.image_ref }}
           digest: ${{ steps.build.outputs.digest }}