ci(deps): Bump sigstore/cosign-installer from 3.7.0 to 4.0.0

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.7.0 to 4.0.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@v3.7.0...faadad0)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/release-ci.yml

@@ -191,7 +191,7 @@ jobs:
           echo "✅ SBOM generated"
       
       - name: Install Cosign
-        uses: sigstore/cosign-installer@dc72c7d5c4d10cd6bcb8cf6e3fd625a9e5e537da  # v3.7.0
+        uses: sigstore/cosign-installer@faadad0cce49287aee09b3a48701e75088a2c6ad  # v4.0.0
 
       - name: Sign SBOM (keyless OIDC)
         run: |

.github/workflows/release-day60.yml

@@ -145,7 +145,7 @@ jobs:
           name: sbom
 
       - name: Install Cosign (Apache 2.0)
-        uses: sigstore/cosign-installer@398d4b0eeef1380460a10c8013a76f728fb906ac  # v3
+        uses: sigstore/cosign-installer@faadad0cce49287aee09b3a48701e75088a2c6ad  # v4.0.0
 
       - name: Generate SLSA L2 Provenance (Day 60)
         run: |