Bump slsa-framework/slsa-verifier from 2.2.0 to 2.6.0

Bumps [slsa-framework/slsa-verifier](https://github.com/slsa-framework/slsa-verifier) from 2.2.0 to 2.6.0.
- [Release notes](https://github.com/slsa-framework/slsa-verifier/releases)
- [Changelog](https://github.com/slsa-framework/slsa-verifier/blob/main/RELEASE.md)
- [Commits](slsa-framework/slsa-verifier@v2.2.0...v2.6.0)

---
updated-dependencies:
- dependency-name: slsa-framework/slsa-verifier
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/release.yml

@@ -51,7 +51,7 @@ jobs:
     permissions: read-all
     steps:
       - name: Install SLSA verifier
-        uses: slsa-framework/slsa-verifier/actions/installer@v2.2.0
+        uses: slsa-framework/slsa-verifier/actions/installer@v2.6.0
       - name: Download assets
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}