Merge pull request kubernetes#53128 from dixudx/godeps_fix_grpc_data_race

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

update gRPC to pick up data race fix

**What this PR does / why we need it**:

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes kubernetes#53124

**Special notes for your reviewer**:

**Release note**:

```release-note
update gRPC to v1.6.0 to pick up data race fix grpc/grpc-go#1316 
```

Author: Kubernetes Submit Queue