⬆️ Bump sigstore/cosign-installer from 1.4.1 to 2.0.0

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 1.4.1 to 2.0.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@v1.4.1...v2.0.0)

---
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/ci.yaml

@@ -77,7 +77,7 @@ jobs:
           go-version: 1.17
 
       - name: Install cosign
-        uses: sigstore/cosign-installer@v1.4.1
+        uses: sigstore/cosign-installer@v2.0.0
         with:
           cosign-release: 'v1.4.1'
 
@@ -151,7 +151,7 @@ jobs:
 
     steps:
       - name: Install cosign
-        uses: sigstore/cosign-installer@v1.4.1
+        uses: sigstore/cosign-installer@v2.0.0
         with:
           cosign-release: 'v1.4.1'