deps: bump sigstore/cosign-installer from 4.1.1 to 4.1.2

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 4.1.1 to 4.1.2.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](https://github.com/sigstore/cosign-installer/compare/cad07c2e89fa2edd6e2d7bab4c1aa38e53f76003...6f9f17788090df1f26f669e9d70d6ae9567deba6)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-version: 4.1.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

.github/workflows/build.yml

@@ -171,7 +171,7 @@ jobs:
       # Signing is disabled by default. To enable, see README.md "Optional: Enable Image Signing" section.
 
       - name: Install Cosign
-        uses: sigstore/cosign-installer@cad07c2e89fa2edd6e2d7bab4c1aa38e53f76003 # v4.1.1
+        uses: sigstore/cosign-installer@6f9f17788090df1f26f669e9d70d6ae9567deba6 # v4.1.2
         if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
       
       - name: Sign container image