Bump protoc from 3.6.1 to 3.17.3

[dependabot-preview]

Bumps protoc from 3.6.1 to 3.17.3.

Release notes

Sourced from protoc's releases.

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)
• Restrict extension setter and getter operators to non-nullable T.

Java

• updating GSON and Guava to more recent versions (#8524)
• Reduce the time spent evaluating isExtensionNumber by storing the extension ranges in a TreeMap for faster queries. This is particularly relevant for protos which define a large number of extension ranges, for example when each tag is defined as an extension.
• Fix java bytecode estimation logic for optional fields.
• Optimize Descriptor.isExtensionNumber.

Python

• Add MethodDescriptor.CopyToProto() (#8327)
• Remove unused python_protobuf.{cc,h} (#8513)
• Start publishing python aarch64 manylinux wheels normally (#8530)
• Fix constness issue detected by MSVC standard conforming mode (#8568)

... (truncated)

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