Updating org.apache.oltu.oauth2.client (#13411)

Updating the OAuth2 client (although obsolete, it's still productive in openapi-generator) due to security problems related to the underlying libraries
* sonatype-2022-3061
* sonatype-2012-0050

Update pom.mustache

samples/client/petstore/java/okhttp-gson-dynamicOperations/src/main/java/org/openapitools/client/auth/OAuthOkHttpClient.java

@@ -55,6 +55,7 @@ public class OAuthOkHttpClient implements HttpClient {
                     response.body().string(),
                     response.body().contentType().toString(),
                     response.code(),
+                    response.headers().toMultimap(),
                     responseClass);
         } catch (IOException e) {
             throw new OAuthSystemException(e);