Use sigstore-cli:0.2.2

The release workflow saw this issue:

    I, [2025-12-15T11:43:57.896604 #2185]  INFO -- : Downloaded 6494e21ea73fa7ee769f85f57d5a3e6a08725eae1e38c755fc3517c9e6bc0b66.trusted_root.json to /home/runner/.cache/sigstore-ruby/sigstore/tuf/https%3A%2F%2Ftuf-repo-cdn.sigstore.dev/trusted_root.json
    Unsupported key type PKIX_ED25519 (Sigstore::Error::UnsupportedKeyType)

This has been addressed in 0.2.2, references:

- sigstore/sigstore-ruby#263
- sigstore/sigstore-ruby#266
- sigstore/sigstore-ruby#270

Author: dentarg

.github/workflows/release.yml

@@ -23,6 +23,6 @@ jobs:
       - run: gem build rubocop-eightyfourcodes
       - run: gem install *.gem
       - run: |
-          ruby -S gem exec sigstore-cli:0.2.1 sign *.gem --bundle attestation.sigstore.json
+          ruby -S gem exec sigstore-cli:0.2.2 sign *.gem --bundle attestation.sigstore.json
       - run: |
           gem push --attestation attestation.sigstore.json *.gem