Update dependency grpc to v1.71.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
grpc	1.70.1 -> 1.71.0

---

Configuration

📅 Schedule: Branch creation - "every weekend" in timezone Japan, Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

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

---

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

---

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 4.27%. Comparing base (7506185) to head (12385c0).

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #148   +/-   ##
======================================
  Coverage    4.27%   4.27%           
======================================
  Files          21      21           
  Lines        1662    1662           
======================================
  Hits           71      71           
  Misses       1585    1585           
  Partials        6       6           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.