Bump Grpc.Core from 1.19.0 to 2.35.0 in /GrpcHost

[dependabot-preview]

Bumps Grpc.Core from 1.19.0 to 2.35.0.

Release notes

Sourced from Grpc.Core's releases.

Release 1.35.0

This is release 1.35.0 (gecko) of gRPC Core.

For gRPC documentation, see grpc.io. For previous releases, see Releases.

This release contains refinements, improvements, and bug fixes, with highlights listed below.

Core

• Backport "Fix implicit declaration error in zlib + macOS #24979". (#25133)
• xDS features doc update for case insensitive prefix/full path matching. (#24999)
• Add darwin_arm64 and darwin_arm64e to c-ares config settings. (#24872)
• Add FileWatcher CertificateProvider. (#24600)
• Protect xds security code with the environment variable "GRPC_XDS_EXPERIMENTAL_SECURITY_SUPPORT". (#24780)

C++

• Upgrade bazel to 3.7.1 (repository-wide). (#25000)
• Makefile: remove support for building protobuf, C++ libraries and executables. (#24000)

C#

• fix nuget package signing on Linux (do not use PublicSign=true on non-windows). (#24980)
• Remove C# as a supported language for xDS features. (#24982)
• Fix C# native library loading in .NET 5 single-file apps. (#24744)

Python

• Fix visibility of libprotobuf symbols in protoc_compiler.so on Mac. (#24992)
• [Aio] Correct type annotation of grpc.aio.ServicerContext.abort. (#24946)
• Add limit concurrent RPC feature to asyncio server. (#24818)
• [Aio] Fix the emtpy response handling in streaming RPC. (#24801)
• [Backport] Implement grpc.Future interface in SingleThreadedRendezvous. (#24574)
• [Backport] Make Python 2 an optional dependency for Bazel build. (#24452)

Ruby

• Fix implicit decalaration in rb_event_thread.c. (#24962)
• Base the ruby build off of latest rake-compiler-dock/manylinux14 images, add ruby 3.0 binary packages. (#25070)
• Ruby: add support to circuit_breaking xds interop test case. (#25028)
• Binary packages (for example, grpc-1.35.0-x86_64-linux.gem):
  • Are now compatible with ruby 3.0
  • Are now built off of manylinux14 (we no longer support Centos 6)

... (truncated)

Changelog

Sourced from Grpc.Core's changelog.

gRPC Release Schedule

Below is the release schedule for gRPC Java, Go and Core and its dependent languages C++, C#, Objective-C, PHP, Python and Ruby.

Releases are scheduled every six weeks on Tuesdays on a best effort basis. In some unavoidable situations a release may be delayed or a language may skip a release altogether and do the next release to catch up with other languages. See the past releases in the links above. A six-week cycle gives us a good balance between delivering new features/fixes quickly and keeping the release overhead low.

Releases are cut from release branches. For Core and Java repos, the release branch is cut two weeks before the scheduled release date. For Go, the branch is cut just before the release. An RC (release candidate) is published for Core and its dependent languages just after the branch cut. This RC is later promoted to release version if no further changes are made to the release branch. We do our best to keep head of master branch stable at all times regardless of release schedule. Daily build packages from master branch for C#, PHP, Python, Ruby and Protoc plugins are published on packages.grpc.io. If you depend on gRPC in production we recommend to set up your CI system to test the RCs and, if possible, the daily builds.

Names of gRPC releases are here.

Release	Scheduled Branch Cut	Scheduled Release Date
v1.17.0	Nov 19, 2018	Dec 4, 2018
v1.18.0	Jan 2, 2019	Jan 15, 2019

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