Bump sigstore/cosign-installer in /.github/actions/sign

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.9.2 to 3.10.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@d58896d...d7543c9)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-version: 3.10.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/actions/sign/action.yml

@@ -25,7 +25,7 @@ runs:
   using: "composite"
   steps:
     - name: Install Cosign
-      uses: sigstore/cosign-installer@d58896d6a1865668819e1d91763c7751a165e159 # v3.9.2
+      uses: sigstore/cosign-installer@d7543c93d881b35a8faa02e8e3605f69b7a1ce62 # v3.10.0
 
     - name: Sign Image with Signing Secret
       if: ${{ inputs.signing-secret != '' }}