Bump grpcio from 1.63.0 to 1.64.1 in /requirements

[dependabot[bot]]

Bumps grpcio from 1.63.0 to 1.64.1.

Release notes

Sourced from grpcio's releases.

Release v1.64.1

This is release 1.64.1 (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

• [StatsPlugin] Fix use-after-free issue (#36664). (#36670)

C++

• [OTel] Generate pkg-config file for grpcpp_otel_plugin (#36686). (#36722)
• [OTel] Add find_package call for OTel dependency in installed gRPC configuration (#36674). (#36688)

Python

• [Python Server] Remove abstractmethod notation for add_registered_method_handlers (v1.64.x backport). (#36696)

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)

... (truncated)

Commits

• d799491 [Release] Bump version to 1.64.1 (on v1.64.x branch) (#36748)
• 74eedcc [backport][build] Update Gazelle bazel dependency (#36745) (#36746)
• c0216b4 [OTel] Generate pkg-config file for grpcpp_otel_plugin (#36686) (#36722)
• 192c054 [OTel] Add latency view to example (#36601) (#36720)
• f740f35 [Python Server] Remove abstractmethod notation for add_registered_method_hand...
• c64a23d [OTel] Add find_package call for OTel dependency in installed gRPC configurat...
• fbd6f95 C++20 compat: use invoke_result_t for C++17 and up (#36016) (#36690)
• 979afe0 [StatsPlugin] Fix use-after-free issue (#36664) (#36670)
• 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)
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