Log Message:
protobuf py-protobuf: updated to [5.]27.3

Protocol Buffers v27.3

Protobuf News may include additional announcements or pre-announcements for \ 
upcoming changes.

Compiler

Revert workaround for std::mutex issues on github windows runners. (ba3e7d7)

C++

Update staleness (b7ef2ca)
Omit the _raw_default_instance_ declaration when using DLL linkage. (22d9a03)
Refactor the way we turn on the optimization in StrongPointer. (a15c9c5)

Java

Omit the _raw_default_instance_ declaration when using DLL linkage. (22d9a03)

PHP

PHP C-Extension

Fix segmentation faults with enabled keep_descriptor_pool_after_request

Ruby

Ruby C-Extension

[Ruby] Fix mismatched pointer type

Other

Remove /utf-8 flag added in #14197 (e20cb7a)
Downgrade CMake to 3.29 to workaround Abseil issue. (8a579c1)
Upgrade macos-11 tests to macos-12 (aec8a76)
Use explicit names of our large runners (4e3b4f0)
Upgrade our C++ release tests to large runners.