chore(deps): bump sigstore/cosign-installer from 3.8.1 to 3.9.1 (#1798)

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.8.1 to 3.9.1.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](https://github.com/sigstore/cosign-installer/compare/v3.8.1...v3.9.1)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-version: 3.9.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/build-test-deploy.yaml

@@ -233,7 +233,7 @@ jobs:
         with:
           go-version: "1.23"
 
-      - uses: sigstore/cosign-installer@v3.8.1
+      - uses: sigstore/cosign-installer@v3.9.1
 
       - name: Get Cosign Key
         run: |