default void close() throws IOException {
        // This method left intentionally blank.
    }
Lifecycle method to perform a clean shutdown of the {@link VerificationKeyResolver}.
This must be performed by the caller to ensure the correct state, freeing up
and releasing any resources performed in {@link #init()}.

@throws IOException Thrown on errors related to IO during closure
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/secured/CloseableVerificationKeyResolver.java