Bump grpcio from 1.8.4 to 1.20.1

[dependabot-preview]

Bumps grpcio from 1.8.4 to 1.20.1.

Release notes

Sourced from grpcio's releases.

Release v1.20.1

This is the 1.20.1 release (godric) 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

• Revert "Enable SIO_LOOPBACK_FAST_PATH on Windows" (for v1.20.x). (#18834)

Python

• Backport c-ares gevent segfault fix to v1.20.1. (#18867)

Release v1.20.0

This is the 1.20.0 release (godric) 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 bug in CFStream endpoint. (#18381)
• Fix a NULL deref in tcp_client_windows.cc. (#18545)
• Avoid using grpc_core::Executor when the background poller is available. (#18501)
• Update the c-ares submodule to the 1.15 release. (#18519)
• Remove unnecessary hack which causes data races. (#18481)
• Fix Potentially Dangerous Typo - locked function being run outside of combiner. (#18482)
• Trace log the status of every c-ares lookup; cleanup error handling. (#18384)
• Add SPIFFE security stack to gRPC . (#18115)
• Nuking the poll-cv polling engine. (#18298)
• Backport #18201 to fix "symbol not found: _ares_library_init" error in Bazel on MacOS build. (#18202)
• Roll-forward PR17308. (#18157)
• Run run_after_write closures in h2 once write action is done. (#18163)
• Transition into state CONNECTING when we start name resolution. (#18141)
• Support "darwin_x86_64" CPU in cares.BUILD. (#18125)
• Move grpc_shutdown internals to a detached thread. (#17308)
• Fix c-ares on Windows "DNS resolution failure" triggered by logging. (#18084)
• Disable c-ares on Android. (#18046)

C++

• Global Interceptor Registration allowed only once. (#17978)
• cmake fix: builds disabled by CODEGEN=OFF should not be installed. (#18151)
• cmake: when cross-compiling, the host grpc_cpp_plugin should be used. (#11795)

... (truncated)

Changelog

Sourced from grpcio'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
v1.19.0	Feb 12, 2019	Feb 26, 2019
v1.20.0	Mar 26, 2019	Apr 9, 2019
v1.21.0	May 7, 2019	May 21, 2019
v1.22.0	Jun 18, 2019	Jul 2, 2019
v1.23.0	Jul 30, 2019	Aug 13, 2019
v1.24.0	Sept 10, 2019	Sept 24, 2019
v1.25.0	Oct 22, 2019	Nov 5, 2019
v1.26.0	Dec 3, 2019	Dec 17, 2019

Commits

• 7741e80 Merge pull request #18867 from lidizheng/backport-gevent-fix
• b2c9749 Merge pull request #18866 from lidizheng/v1.20.x
• ee47d5e Regenerate projects
• 365c118 Bump version to v1.20.1
• ffe2057 Revert "Revert "Merge pull request #18547 from lidizheng/fix-gevent""
• bc9c63f Merge pull request #18845 from jtattermusch/backport_18771
• df390f7 Merge pull request #18844 from jtattermusch/backport_18714
• f53eca2 add non-internal build.cfg files for bazel RBE jobs
• d5c3108 workaround the need to source activate.sh
• 995b014 Update aspnetcore interop scripts to use activate.sh
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #62.