Bump Grpc.Core from 1.19.0 to 2.26.0 in /src

[dependabot-preview[bot]]

Bumps Grpc.Core from 1.19.0 to 2.26.0.

Release notes

Sourced from Grpc.Core's releases.

Release v1.26.0

This is the 1.26.0 release (gon) of gRPC Core.

Please see the notes for the previous releases here: https://github.com/grpc/grpc/releases. Please consult https://grpc.io/ for all information regarding this product.

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

Core

• Fix compression filter crash on empty payload. (#21315)
• Ensure awake pollset_work threads exist on Windows. (#19311)
• Disable client_idle_filter. (#20910)
• Remove gpr_get/set_allocation_functions. (#20462)
• Security audit response. (#20839)

C++

• Automatically disable testing frameworks if gRPC_BUILD_TESTS=OFF. (#20976)
• Do not build channelz when gRPC_USE_PROTO_LITE. (#21011)
• Add options for all codegen plugins. (#20629)
• gRPC-C++ podspec follows gRPC versioning. (#20977)
• Issue 19208: Fix pollset_set_del_fd to cleanup all fd references. (#20452)
• De-duplicate .proto file processing. (#20537)
• cmake: Add VERSION and SOVERSION properties to libraries. (#20770)

C#

• C# Fix Unobserved Task Exception problem for cancelled calls with unexhausted response stream. (#21202)
• Fix C# sending empty payloads with gzip compression. (#21266)
• C#: fix #20782. (#20859)

Objective-C

• Update GRPCUnaryResponseHandler with generics. (#21316)

Python

• Release Python3.8 wheels for Windows. (#21271)
• Release Python3.8 wheel on macOS. (#21270)
• Fix issue with exception being out of scope in Python 3. (#20314)
• [AIO] Implement the shutdown process for AIO server and completion queue. (#20805)
• Attempt to drop support for Python 3.4. (#20789)
• AIO Unified call interface. (#20824)
• Make sure Core aware of gevent Cython objects. (#20891)

... (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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