chore(deps): bump sigstore/cosign-installer from 2.0.1 to 2.1.0 (#473)

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 2.0.1 to 2.1.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@v2.0.1...v2.1.0)

---
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>

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

.github/workflows/build.yml

@@ -104,7 +104,7 @@ jobs:
           key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
           restore-keys: |
             ${{ runner.os }}-go-
-      - uses: sigstore/cosign-installer@v2.0.1
+      - uses: sigstore/cosign-installer@v2.1.0
       - uses: anchore/sbom-action/download-syft@v0.6.0
       - uses: docker/setup-qemu-action@v1
       - uses: docker/setup-buildx-action@v1