- Update to version 3.12.3; notable changes since 3.11.4:
  Protocol Compiler
  * [experimental] Singular, non-message typed fields in proto3 now support
    presence tracking. This is enabled by adding the "optional" field label and
    passing the --experimental_allow_proto3_optional flag to protoc.
    * For usage info, see docs/field_presence.md.
    * During this experimental phase, code generators should update to support
      proto3 presence, see docs/implementing_proto3_presence.md for instructions.
  * Allow duplicate symbol names when multiple descriptor sets are passed on
    the command-line, to match the behavior when multiple .proto files are passed.
  * Deterministic `protoc --descriptor_set_out` (#7175)
  Objective-C
  * Tweak the union used for Extensions to support old generated code. #7573
  * Fix for the :protobuf_objc target in the Bazel BUILD file. (#7538)
  * [experimental] ObjC Proto3 optional support (#7421)
  * Block subclassing of generated classes (#7124)
  * Use references to Obj C classes instead of names in descriptors. (#7026)
  * Revisit how the WKTs are bundled with ObjC. (#7173)
  C++
  * Simplified the template export macros to fix the build for mingw32. (#7539)
  * [experimental] Added proto3 presence support.
  * New descriptor APIs to support proto3 presence.
  * Enable Arenas by default on all .proto files.
  * Documented that users are not allowed to subclass Message or MessageLite.
  * Mark generated classes as final; inheriting from protos is strongly discouraged.
  * Add stack overflow protection for text format with unknown fields.
  * Add accessors for map key and value FieldDescriptors.
  * Add FieldMaskUtil::FromFieldNumbers().
  * MessageDifferencer: use ParsePartial() on Any fields so the diff does not
    fail when there are missing required fields.

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