chore(deps): bump sigstore/cosign-installer

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from c3667d99424e7e6047999fb6246c0da843953c65 to 9c520b997e685cb69e1ac226f7dce8114e8f36df.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@c3667d9...9c520b9)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-type: direct:production
...

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

Author: dependabot[bot]

.github/workflows/images.yaml

@@ -96,7 +96,7 @@ jobs:
 
     # Sign images if not a PR.
     - if: github.event_name != 'pull_request'
-      uses: sigstore/cosign-installer@c3667d99424e7e6047999fb6246c0da843953c65 # v3.0.1
+      uses: sigstore/cosign-installer@9c520b997e685cb69e1ac226f7dce8114e8f36df # v3.0.1
     - if: github.event_name != 'pull_request'
       run: |
         cosign sign --yes \