enable renovate auto-merge

[kmansou]

Summary

• Fix asn1.Marshal(key) → asn1.Marshal(*key) in both rsaoaep and gcpkms — the asn1 package does not accept a pointer-to-struct, so keyID() was always returning an error
• Update google.golang.org/api from v0.114.0 → v0.272.0 (and transitive deps) to resolve a build failure introduced when dependabot bumped grpc to v1.79.3 in chore(deps): Bump google.golang.org/grpc from 1.56.3 to 1.79.3 in /gcpkms #34 without a matching api update
• Add rsaoaep/recipient_test.go: covers NewRecipient, stanza type/args, encrypt→decrypt round-trip, and keyID determinism/uniqueness
• Add gcpkms/identity_test.go: covers parsePEMEncodedRSAPublicKey, keyID, crc32c (with CRC32C standard test vector), and all non-KMS Unwrap code paths