build(deps): bump sigstore/cosign-installer from 2.7.0 to 2.8.0 (#570)

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@v2.7.0...v2.8.0)

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

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

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

.github/workflows/release-snapshot.yaml

@@ -42,7 +42,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-go-
       - name: Install cosign
-        uses: sigstore/cosign-installer@v2.7.0
+        uses: sigstore/cosign-installer@v2.8.0
       - name: Release snapshot
         uses: goreleaser/goreleaser-action@v3
         with:

.github/workflows/release.yaml

@@ -105,7 +105,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-go-
       - name: Install cosign
-        uses: sigstore/cosign-installer@v2.7.0
+        uses: sigstore/cosign-installer@v2.8.0
       - name: Login to docker.io registry
         uses: docker/login-action@v2
         with: