:arrow_up: Update dependency grpcio to v1.64.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
grpcio (source)	==1.64.0 -> ==1.64.1

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Release Notes

grpc/grpc (grpcio)

### [`v1.64.1`](https://togithub.com/grpc/grpc/releases/tag/v1.64.1) [Compare Source](https://togithub.com/grpc/grpc/compare/v1.64.0...v1.64.1) This is release 1.64.1 ([grateful](https://togithub.com/grpc/grpc/blob/master/doc/g_stands_for.md)) of gRPC Core. For gRPC documentation, see [grpc.io](https://grpc.io/). For previous releases, see [Releases](https://togithub.com/grpc/grpc/releases). This release contains refinements, improvements, and bug fixes, with highlights listed below. ## Core - \[StatsPlugin] Fix use-after-free issue ([#​36664](https://togithub.com/grpc/grpc/issues/36664)). ([#​36670](https://togithub.com/grpc/grpc/pull/36670)) ## C++ - \[OTel] Generate pkg-config file for grpcpp_otel_plugin ([#​36686](https://togithub.com/grpc/grpc/issues/36686)). ([#​36722](https://togithub.com/grpc/grpc/pull/36722)) - \[OTel] Add find_package call for OTel dependency in installed gRPC configuration ([#​36674](https://togithub.com/grpc/grpc/issues/36674)). ([#​36688](https://togithub.com/grpc/grpc/pull/36688)) ## Python - \[Python Server] Remove abstractmethod notation for add_registered_method_handlers (v1.64.x backport). ([#​36696](https://togithub.com/grpc/grpc/pull/36696))

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