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Previously UnAuthenticatedServerOAuth2AuthorizedClientRepository used a HashMap for storing OAuth2AuthorizedClients. UnAuthenticatedServerOAuth2AuthorizedClientRepository and its HashMap are potentially accessed by multiple threads without any synchronization. Since HashMap is not threadsafe itself, this makes UnAuthenticatedServerOAuth2AuthorizedClientRepository not threadsafe. Now UnAuthenticatedServerOAuth2AuthorizedClientRepository uses a ConcurrentHashMap for storing OAuth2AuthorizedClients. Since ConcurrentHashMap is threadsafe, UnAuthenticatedServerOAuth2AuthorizedClientRepository will now be threadsafe as well. Fixes gh-6717