fix(deps): update module google.golang.org/grpc to v1.81.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
google.golang.org/grpc	v1.81.0 → v1.81.1

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Release Notes

grpc/grpc-go (google.golang.org/grpc)

v1.81.1: Release 1.81.1

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Security

• xds/rbac: Fix a potential authorization bypass caused by incorrectly falling through URI/DNS SANs to Subject Distinguished Name (DN) when matching the authenticated principal name. With this fix, only the first non-empty identity source will be used, as per gRFC A41. (#​9111)
  • Special Thanks: @​al4an444

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