Update dependency kubernetes/kubectl to v1.31.6 · cybozu-go/website-operator@932f123

Failed to save: Failed to CreateCacheEntry: Received non-retryable error: Failed request: (409) Conflict: cache entry with the same key, version, and scope already exists

Failed to restore: "/usr/bin/tar" failed with error: The process '/usr/bin/tar' failed with exit code 2

Cache not found for keys: docker.io--tonistiigi--binfmt-latest-linux-x64