MAINT: Bump grpcio from 1.63.0 to 1.64.0 in the core group

[dependabot]

Bumps the core group with 1 update: grpcio.

Updates grpcio from 1.63.0 to 1.64.0

Release notes

Sourced from grpcio's releases.

Release v1.64.0

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)

Release v1.64.0-pre2

This is a prerelease of gRPC Core 1.64.0 (grateful).

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

This prerelease contains refinements, improvements, and bug fixes.

Release v1.64.0-pre1

This is a prerelease of gRPC Core 1.64.0 (grateful).

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

This prerelease contains refinements, improvements, and bug fixes.

Commits

• b8a04ac [Release] Bump version to 1.64.0 (on v1.64.x branch) (#36633)
• acd8b33 [Release] Bump version to 1.64.0-pre2 (on v1.64.x branch) (#36573)
• 9cd019a Revert "[transport] Centralize ref-counting between transports (#36460)" (#36...
• 03e6617 [Gpr_To_Absl_Logging] Disable absl logging (#36546)
• 7062f29 [Release] Bump version to 1.64.0-pre1 (on v1.64.x branch) (#36545)
• 32e0317 [reorg] move xds code to src/core/xds (#36521)
• 09a29d3 [grpc][Gpr_To_Absl_Logging] Migrating from gpr to absl logging GPR_ASSERT (#3...
• 7cc547d [grpc][Gpr_To_Absl_Logging] Migrating from gpr to absl logging - gpr_log (#36...
• a20f020 [grpc][Gpr_To_Absl_Logging] Migrating from gpr to absl logging GPR_ASSERT (#3...
• fb72f1d [grpc][Gpr_To_Absl_Logging] Migrating from gpr to absl logging GPR_ASSERT (#3...
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