fix(deps): update grpc-java monorepo to v1.81.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
io.grpc:protoc-gen-grpc-java	1.80.0 → 1.81.0
io.grpc:grpc-stub	1.80.0 → 1.81.0
io.grpc:grpc-services	1.80.0 → 1.81.0
io.grpc:grpc-protobuf	1.80.0 → 1.81.0
io.grpc:grpc-netty-shaded	1.80.0 → 1.81.0

---

Release Notes

grpc/grpc-java (io.grpc:protoc-gen-grpc-java)

v1.81.0

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • At any time (no schedule defined)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about these updates again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.