Bump sigstore/cosign-installer from 2.8.1 to 3.2.0

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 2.8.1 to 3.2.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@v2.8.1...v3.2.0)

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

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

.github/workflows/release.yml

@@ -31,7 +31,7 @@ jobs:
           key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
           restore-keys: |
             ${{ runner.os }}-go-
-      - uses: sigstore/cosign-installer@v2.8.1         # installs cosign
+      - uses: sigstore/cosign-installer@v3.2.0         # installs cosign
       - uses: anchore/sbom-action/download-syft@v0.13.1 # installs syft
       - uses: docker/login-action@v2                   # login to ghcr
         with: