build(deps): bump google-protobuf from 3.11.4 to 3.12.2

[dependabot-preview]

Bumps google-protobuf from 3.11.4 to 3.12.2.

Release notes

Sourced from google-protobuf's releases.

Protocol Buffers v3.12.2

C++

• Simplified the template export macros to fix the build for mingw32. (#7539)

Objective-C

• Fix for the :protobuf_objc target in the Bazel BUILD file. (#7538)

Protocol Buffers v3.12.1

Ruby

• Re-add binary gems for Ruby 2.3 and 2.4. These are EOL upstream, however many people still use them and dropping support will require more coordination. (#7529, #7531).

Protocol Buffers v3.12.0

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 https://github.com/protocolbuffers/protobuf/blob/HEAD/docs/field_presence.md.
  • During this experimental phase, code generators should update to support proto3 presence, see https://github.com/protocolbuffers/protobuf/blob/HEAD/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)

C++

• [experimental] Added proto3 presence support.
• New descriptor APIs to support proto3 presence.
• Fix for #7463 in -rc1 (core dump mixing optional and singular fields in proto3)
• 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.
• ReflectionOps::Merge(): lookup messages in the right factory, if it can.
• Added Descriptor::WellKnownTypes enum and Descriptor::well_known_type() accessor as an easier way of determining if a message is a Well-Known Type.
• Optimized RepeatedField::Add() when it is used in a loop.
• Made proto move/swap more efficient.
• De-virtualize the GetArena() method in MessageLite.
• Improves performance of json_stream_parser.cc by factor 1000 (#7230)
• bug: #7076 undefine Windows OUT and OPTIONAL macros (#7087)
• Fixed a bug in FieldDescriptor::DebugString() that would erroneously print an "optional" label for a field in a oneof.
• Fix bug in parsing bool extensions that assumed they are always 1 byte.
• Fix off-by-one error in FieldOptions::ByteSize() when extensions are present.
• Clarified the comments to show an example of the difference between

... (truncated)

Commits

• 678da4f Updated the changelog for the 3.12.2 release.
• beeb621 Update protobuf version (#7557)
• 746c46e Switch to using git@ for clone, to avoid having to enter password. (#7556)
• ef22086 Fix :protobuf_objc bazel target (#7538)
• 29de97c Cherry-pick of df719723: Simplify template exporting macros (#7539)
• a37cc13 Added changelog entry for 3.12.1.
• 6ad138d Update protobuf version (#7535)
• cf81f38 Restore binary builds of Ruby 2.3 and 2.4 (#7529) (#7531)
• 0dd036d Added a changelog entry about the Java fix. (#7516)
• e90b71c Update protobuf version
• Additional commits viewable in compare view

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