Bump protobuf from 3.12.2 to 3.18.3

[dependabot[bot]]

Bumps protobuf from 3.12.2 to 3.18.3.

Release notes

Sourced from protobuf's releases.

Protocol Buffers v3.18.3

C++

• Reduce memory consumption of MessageSet parsing
• This release addresses a Security Advisory for C++ and Python users

Protocol Buffers v3.16.1

Java

• Improve performance characteristics of UnknownFieldSet parsing (#9371)

Protocol Buffers v3.18.2

Java

• Improve performance characteristics of UnknownFieldSet parsing (#9371)

Protocol Buffers v3.18.1

Python

• Update setup.py to reflect that we now require at least Python 3.5 (#8989)
• Performance fix for DynamicMessage: force GetRaw() to be inlined (#9023)

Ruby

• Update ruby_generator.cc to allow proto2 imports in proto3 (#9003)

Protocol Buffers v3.18.0

C++

• Fix warnings raised by clang 11 (#8664)
• Make StringPiece constructible from std::string_view (#8707)
• Add missing capability attributes for LLVM 12 (#8714)
• Stop using std::iterator (deprecated in C++17). (#8741)
• Move field_access_listener from libprotobuf-lite to libprotobuf (#8775)
• Fix #7047 Safely handle setlocale (#8735)
• Remove deprecated version of SetTotalBytesLimit() (#8794)
• Support arena allocation of google::protobuf::AnyMetadata (#8758)
• Fix undefined symbol error around SharedCtor() (#8827)
• Fix default value of enum(int) in json_util with proto2 (#8835)
• Better Smaller ByteSizeLong
• Introduce event filters for inject_field_listener_events
• Reduce memory usage of DescriptorPool
• For lazy fields copy serialized form when allowed.
• Re-introduce the InlinedStringField class
• v2 access listener
• Reduce padding in the proto's ExtensionRegistry map.
• GetExtension performance optimizations
• Make tracker a static variable rather than call static functions
• Support extensions in field access listener
• Annotate MergeFrom for field access listener
• Fix incomplete types for field access listener
• Add map_entry/new_map_entry to SpecificField in MessageDifferencer. They record the map items which are different in MessageDifferencer's reporter.
• Reduce binary size due to fieldless proto messages
• TextFormat: ParseInfoTree supports getting field end location in addition to start.

... (truncated)

Commits

• a902b39 No-op whitespace change
• ae62acd Updating version.json and repo version numbers to: 18.3
• f43ac49 Merge pull request #10542 from deannagarcia/3.18.x
• 9efdf55 Add missing includes
• d1635e1 Apply patch
• 5b37c91 Update version.json with "lts": true (#10534)
• c39d622 Merge pull request #10529 from protocolbuffers/deannagarcia-patch-5
• f77d3b6 Update version.json
• 8178b06 Merge pull request #10503 from deannagarcia/3.18.x
• 24ca839 Add version file
• Additional commits viewable in compare view

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