Bump protobuf from 3.5.2 to 3.13.0

[dependabot-preview]

Bumps protobuf from 3.5.2 to 3.13.0.

Release notes

Sourced from protobuf's releases.

Protocol Buffers v3.13.0

No release notes provided.

v3.13.0-rc3

No release notes provided.

Protocol Buffers v3.12.4

No release notes provided.

Protocol Buffers v3.12.3

Objective-C

• Tweak the union used for Extensions to support old generated code. #7573

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.

Commits

• fde7cf7 Update protobuf version
• 0710535 Fix segment fault for proto3 optional (#7805)
• 2ad43bf Fixed tests for Python 2 in python/release.sh
• 1498286 Removed conflicting C# version line
• 98c2e69 Update protobuf version
• 5ce6232 No need to generate addtional has method for proto2 (#7802)
• d4ca929 Port php c extension to php8 (#7793)
• 008c721 Add docker file for php8.0 (#7790)
• 8947701 Add docker file for php8.0
• 610bbd0 Fixed compile_extension.sh --release to actually enable optimization. (#7766)
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #138.