Update dependency grpcio to v1.69.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
grpcio (source)	1.68.1 -> 1.69.0

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Release Notes

grpc/grpc (grpcio)

v1.69.0

Compare Source

This is release 1.69.0 (gridiron) 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

• [Alarm] Fix Alarm reuse on cancellation. (#​38114)
• [xDS RBAC] Support string_match in HeaderMatcher. (#​38185)
• [pick_first] fix shutdown bug in new PF impl. (#​38144)
• [c-ares] Fix inverted length check in GrpcPolledFdWindows. (#​38101)
• [RetryFilter] Copy the SliceBuffer from RetryFilter's cache to batch payload. (#​38069)
• [EventEngine] Add stronger wording on Endpoint::Read contract. (#​38036)
• [chttp2] Fix channelz address. (#​38022)
• [XdsClient] Add missing authority to XdsClient metrics scope. (#​38009)
• [EventEngine] API contract: Endpoint::Read will provide either an error or data, but never both. (#​38019)
• [Build] Dropped Bazel 6.x support. (#​37979)

Python

• [Build] Override MACOSX_DEPLOYMENT_TARGET for gRPC Python. (#​37997)

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