chore(deps): bump sigstore/cosign-installer from 3.9.2 to 4.0.0 (#199)

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.9.2 to 4.0.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@d58896d...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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build-verify.yml

@@ -65,7 +65,7 @@ jobs:
 
       - name: Install Cosign
         if: github.repository_owner == 'microcks' && env.PACKAGE_IMAGE == 'true'
-        uses: sigstore/cosign-installer@d58896d6a1865668819e1d91763c7751a165e159 # v3.9.2
+        uses: sigstore/cosign-installer@faadad0cce49287aee09b3a48701e75088a2c6ad # v4.0.0
 
       - name: Set up QEMU
         if: github.repository_owner == 'microcks' && env.PACKAGE_IMAGE == 'true'