chore(deps): update dependency grpcio to v1.64.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
grpcio (source)	==1.63.0 -> ==1.64.0

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Release Notes

grpc/grpc (grpcio)

v1.64.0

Compare Source

This is release 1.64.0 (grateful) 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

• [BoringSSL] Update third_party/boringssl-with-bazel. (#​36435)
• [build] Restrict visibility of grpc_public_hdrs and grpc++_public_hdrs. (#​36289)
• [Deps] Rollfoward Protobuf upgrade to v26.1. (#​36323)

C++

• [CSM] Fix CSM Observability for trailers-only response. (#​36413)
• [CSM] Remove requirement that servers have to be xDS enabled. (#​36410)

Python

• [Asyncio] Semantic task names for RPC tasks. (#​36422)
• [python/systemd] allow compiling systemd support into python builds. (#​36037)
• [Python Otel] Remove opentelemetry version pin. (#​36448)
• [Python Otel] Use registered method at server side. (#​36371)
• [Python grpcio_tools] Update version requirement of protobuf in grpcio_tools. (#​36230)

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.97%. Comparing base (35cfec0) to head (4b44729).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1004   +/-   ##
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  Coverage   92.97%   92.97%           
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  Files          19       19           
  Lines        1821     1821           
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  Hits         1693     1693           
  Misses        128      128           

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