gfe-relnote: use QUIC_foo instead of ABSL_foo for mutex annotations in QUIC. Not flag protected. No behavior change.

This effectively reverts cr/266433516 and cr/266428140 (which were in turn reverts of cr/265958257 and cr/265940959) and then replaces the ABSL_ prefixes with QUIC_

PiperOrigin-RevId: 266445797
Change-Id: I369c0c929e5dc44a332635e695d526a2f91fa3f6
diff --git a/quic/test_tools/quic_crypto_server_config_peer.h b/quic/test_tools/quic_crypto_server_config_peer.h
index 3f5a984..baaa9b8 100644
--- a/quic/test_tools/quic_crypto_server_config_peer.h
+++ b/quic/test_tools/quic_crypto_server_config_peer.h
@@ -73,7 +73,7 @@
   // ConfigsDebug returns a std::string that contains debugging information
   // about the set of Configs loaded in |server_config_| and their status.
   std::string ConfigsDebug()
-      SHARED_LOCKS_REQUIRED(server_config_->configs_lock_);
+      QUIC_SHARED_LOCKS_REQUIRED(server_config_->configs_lock_);
 
   void SelectNewPrimaryConfig(int seconds);