:arrow_up: Update dependency grpcio to v1.66.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
grpcio (source)	==1.66.1 -> ==1.66.2

---

Release Notes

grpc/grpc (grpcio)

### [`v1.66.2`](https://redirect.github.com/grpc/grpc/releases/tag/v1.66.2) [Compare Source](https://redirect.github.com/grpc/grpc/compare/v1.66.1...v1.66.2) This is release gRPC Core 1.66.2 (gladiator). For gRPC documentation, see [grpc.io](https://grpc.io/). For previous releases, see [Releases](https://redirect.github.com/grpc/grpc/releases). This release contains refinements, improvements, and bug fixes. #### What's Changed ##### Python - Added support for Python 3.13 and templating system for supported Python versions ([#​37643](https://redirect.github.com/grpc/grpc/issues/37643)) **Full Changelog**: https://github.com/grpc/grpc/compare/v1.66.1...v1.66.2

---

Configuration

📅 Schedule: Branch creation - "after 5pm every weekday,every weekend,before 9am every weekday" in timezone America/Los_Angeles, 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.