Fix #1210 - use put method to set headers in oauth2 delegate to avoid immutable error#1211

ricardozanini merged 2 commits intoquarkiverse:mainquarkiverse/quarkus-openapi-generator:mainfrom

gabriel-farache:fix/immutable_headergabriel-farache/quarkus-openapi-generator:fix/immutable_headerCopy head branch name to clipboard