Bump mikefarah/yq from 4.20.2 to 4.21.1 (sigstore#1525)

Bumps [mikefarah/yq](https://github.com/mikefarah/yq) from 4.20.2 to 4.21.1.
- [Release notes](https://github.com/mikefarah/yq/releases)
- [Changelog](https://github.com/mikefarah/yq/blob/master/release_notes.txt)
- [Commits](mikefarah/yq@558a180...f0b37ea)

---
updated-dependencies:
- dependency-name: mikefarah/yq
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

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

.github/workflows/kind-e2e-cosigned.yaml

@@ -68,7 +68,7 @@ jobs:
     - uses: imjasonh/setup-ko@2c3450ca27f6e6f2b02e72a40f2163c281a1f675 # v0.4
 
     - name: Install yq
-      uses: mikefarah/yq@558a18029a8c1889186c7850def35dd819e31c0c # v4.16.2
+      uses: mikefarah/yq@f0b37ea06d732d9f4b1aabeb1bbbb14d2d979843 # v4.16.2
 
     - name: Install Cosign
       run: |