Bump Google.Protobuf from 3.7.0 to 3.9.2 in /GrpcHost

[dependabot-preview]

Bumps Google.Protobuf from 3.7.0 to 3.9.2.

Release notes

Sourced from Google.Protobuf's releases.

Protocol Buffers v3.9.2

Objective-C

• Remove OSReadLittle* due to alignment requirements. (#6678)
• Don't use unions and instead use memcpy for the type swaps. (#6672)

Protocol Buffers v3.9.1

Python

• Drop building wheel for python 3.4 (#6406)

Csharp

• Fix binary compatibility in 3.9.0 (delisted) FieldCodec factory methods (#6380)

Protocol Buffers v3.9.0

C++

• Optimize and simplify implementation of RepeatedPtrFieldBase
• Don't create unnecessary unknown field sets.
• Remove branch from accessors to repeated field element array.
• Added delimited parse and serialize util.
• Reduce size by not emitting constants for fieldnumbers
• Fix a bug when comparing finite and infinite field values with explicit tolerances.
• TextFormat::Parser should use a custom Finder to look up extensions by number if one is provided.
• Add MessageLite::Utf8DebugString() to make MessageLite more compatible with Message.
• Fail fast for better performance in DescriptorPool::FindExtensionByNumber() if descriptor has no defined extensions.
• Adding the file name to help debug colliding extensions
• Added FieldDescriptor::PrintableNameForExtension() and DescriptorPool::FindExtensionByPrintableName().
  The latter will replace Reflection::FindKnownExtensionByName().
• Replace NULL with nullptr
• Created a new Add method in repeated field that allows adding a range of elements all at once.
• Enabled enum name-to-value mapping functions for C++ lite
• Avoid dynamic initialization in descriptor.proto generated code
• Move stream functions to MessageLite from Message.
• Move all zero_copy_stream functionality to io_lite.
• Do not create array of matched fields for simple repeated fields
• Enabling silent mode by default to reduce make compilation noise. (#6237)

Java

• Expose TextFormat.Printer and make it configurable. Deprecate the static methods.
• Library for constructing google.protobuf.Struct and google.protobuf.Value
• Make OneofDescriptor extend GenericDescriptor.
• Expose streamingness of service methods from MethodDescriptor.
• Fix a bug where TextFormat fails to parse Any filed with > 1 embedded message sub-fields.
• Establish consistent JsonFormat behavior for nulls in oneofs, regardless of order.
• Update GSON version to 3.8.5. (#6268)
• Add protobuf_java_lite Bazel target. (#6177)

Python

• Change implementation of Name() for enums that allow aliases in proto2 in Python
  to be in line with claims in C++ implementation (to return first value).
• Explicitly say what field cannot be set when the new value fails a type check.
• Duplicate register in descriptor pool will raise errors

... (truncated)

Commits

• 52b2447 Update version to 3.9.2 (#6682)
• cfee7d8 Merge pull request #6680 from thomasvl/objc_fix
• a0eb83f Remove OSReadLittle* due to alignment requirements (#6678)
• 42e0ff5 [ObjC] Don't use unions and instead use memcpy for the type swaps. (#6672)
• 655310c Update protobuf version (#6472)
• ebfde4c No need to update version in generated code (#6471)
• bc5f088 Merge pull request #6431 from jtattermusch/backport_csharp_proto2_review
• 92f2c89 [bazel] Add fixes for --incompatible_load_{cc,java,proto}_rules_from_bzl
• 65ed62e Updated Bazel test script to use most recent Bazel version (#6413) (#6433)
• fce3613 Disable javadoc error (#6371)
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #36.