ci: bump sigstore/cosign-installer in the github-actions group (#9)

Bumps the github-actions group with 1 update: [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer).


Updates `sigstore/cosign-installer` from 3.6.0 to 3.7.0
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@v3.6.0...v3.7.0)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/docker.yml

@@ -34,7 +34,7 @@ jobs:
             # https://github.com/sigstore/cosign-installer
           - name: Install cosign
             if: github.event_name != 'pull_request'
-            uses: sigstore/cosign-installer@v3.6.0
+            uses: sigstore/cosign-installer@v3.7.0
             with:
                 cosign-release: 'v2.4.0'