Update google.golang.org/grpc to v1.81.1

[tmshort]

Description of the change:

Motivation for the change:

Architectural changes:

Testing remarks:

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Bug fixes are accompanied by regression test(s)
• e2e tests and flake fixes are accompanied evidence of flake testing, e.g. executing the test 100(0) times
• tech debt/todo is accompanied by issue link(s) in comments in the surrounding code
• Tests are comprehensible, e.g. Ginkgo DSL is being used appropriately
• Docs updated or added to /doc
• Commit messages sensible and descriptive
• Tests marked as [FLAKE] are truly flaky and have an issue
• Code is properly formatted

[Copilot]

Pull request overview

This PR bumps the vendored google.golang.org/grpc dependency from v1.81.0 to v1.81.1, keeping go.mod, go.sum, and the vendored sources/metadata in sync.

Changes:

• Update google.golang.org/grpc requirement in go.mod to v1.81.1
• Update go.sum entries for google.golang.org/grpc to v1.81.1
• Align vendored metadata/source version markers (vendor/modules.txt, vendor/google.golang.org/grpc/version.go) to v1.81.1

Reviewed changes

Copilot reviewed 1 out of 4 changed files in this pull request and generated no comments.

File	Description
go.mod	Bumps the required gRPC module version to v1.81.1.
go.sum	Updates checksum entries to match google.golang.org/grpc v1.81.1.
vendor/modules.txt	Updates vendored module listing to google.golang.org/grpc v1.81.1.
vendor/google.golang.org/grpc/version.go	Updates the vendored gRPC Version constant to 1.81.1.

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: grokspawn, rashmigottipati

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