Bump protobuf from 3.11.3 to 3.17.3 in /src

[dependabot-preview[bot]]

Bumps protobuf from 3.11.3 to 3.17.3.

Release notes

Sourced from protobuf's releases.

Protocol Buffers v3.17.3

C++

• Introduce FieldAccessListener.
• Stop emitting boilerplate {Copy/Merge}From in each ProtoBuf class
• Fixed some uninitialized variable warnings in generated_message_reflection.cc.

Kotlin

• Fix duplicate proto files error (#8699)

Java

• Fixed parser to check that we are at a proper limit when a sub-message has finished parsing.

General

• Support M1 (#8557)

Protocol Buffers v3.17.2

Kotlin

• Fix duplicate class error (#8653)

PHP

• Fixed SEGV in sub-message getters for well-known types when message is unset (#8670)

Protocol Buffers v3.17.1

PHP

• Fixed PHP memory leaks and arginfo errors. (#8614)
• Fixed JSON parser to allow multiple values from the same oneof as long as all but one are null.

Ruby

• Fixed memory bug: properly root repeated/map field when assigning. (#8639)
• Fixed JSON parser to allow multiple values from the same oneof as long as all but one are null.

Protocol Buffers v3.17.0

Protocol Compiler

• Fix the generated source information for reserved values in Enums.

C++

• Fix -Wunused-parameter in map fields (fixes #8494) (#8500)
• Use byteswap.h when building against musl libc (#8503)
• Fix -Wundefined-inline error when using SharedCtor() or SharedDtor() (#8532)
• Fix bug where Descriptor::DebugString() printed proto3 synthetic oneofs.
• Provide stable versions of SortAndUnique().
• Make sure to cache proto3 optional message fields when they are cleared.
• Expose UnsafeArena methods to Reflection.
• Use std::string::empty() rather than std::string::size() > 0.

Kotlin

• Introduce support for Kotlin protos (#8272)

... (truncated)

Commits

• 909a0f3 Merge pull request #8701 from protocolbuffers/updateChangelogs
• ec645c0 Updating changelog
• e15d56a Merge pull request #8700 from deannagarcia/3.17.x-202106042117
• 367851d Update protobuf version
• 704118b Merge pull request #8699 from deannagarcia/morePomFixes
• 0717715 Removing more from the pom
• 5330d0d Updating pom files
• f5a0e39 Merge branch 'master' into 3.17.x
• 8d8ba6a Merge pull request #8637 from dschopf/fix-qnx-7.0-support
• c05e7ad Merge pull request #8690 from maxgolov/maxgolov/vs2019_16.10_constinit_broken
• Additional commits viewable in compare view

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