Bump sigstore/cosign-installer from 3.1.1 to 3.1.2

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.1.1 to 3.1.2.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@v3.1.1...v3.1.2)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

.github/workflows/docker-publish.yml

@@ -42,7 +42,7 @@ jobs:
       # https://github.com/sigstore/cosign-installer
       - name: Install cosign
         if: github.event_name != 'pull_request'
-        uses: sigstore/[email protected].1 #v2.6.0
+        uses: sigstore/[email protected].2 #v2.6.0
         with:
           cosign-release: 'v1.11.0'