Merge #2786

2786: chore(deps): bump google.golang.org/grpc from 1.21.1 to 1.22.0 in /clients/go r=menski a=dependabot-preview[bot]

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.21.1 to 1.22.0.
<details>
<summary>Release notes</summary>

*Sourced from [google.golang.org/grpc's releases](https://github.com/grpc/grpc-go/releases).*

> ## Release 1.22.0
> # New Features
> 
>  * balancer/resolver: add loadBalancingConfig and pre-parsing support ([#2732](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2732))
> 
> # Performance Improvements
> 
>  * transport: share recv buffers ([#2813](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2813))
>  * Remove call to proto.Clone() in http2Server.WriteStatus. ([#2842](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2842))
> 
> # Bug Fixes
> 
>  * balancer: stop using picker from old balancer when switching balancers ([#2833](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2833))
>  * server: fix race causing streams to be terminated by GracefulStop ([#2857](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2857))
>  * grpclb: only force update picker when cache is used ([#2843](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2843))
>  * metadata: write original md before appended md ([#2879](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2879))
>    - Special Thanks: [@&#8203;elvizlai](https://github.com/elvizlai)
>  * transport: fix bug leading to hang when invalid headers are received ([#2818](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2818))
>  * client: don't reset backoff if updating addresses while in TransientFailure ([#2740](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2740))
> 
> # Documentation
> 
>  * examples: note about ALTS special access permission on GCP ([#2846](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2846))
</details>
<details>
<summary>Commits</summary>

- [`1d89a3c`](grpc/grpc-go@1d89a3c) Change version to 1.22.0 ([#2890](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2890))
- [`73b304d`](grpc/grpc-go@73b304d) xds: bazel proto gen code generation scripts ([#2775](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2775))
- [`95da23b`](grpc/grpc-go@95da23b) xds: load report for server loads (from trailer) ([#2870](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2870))
- [`5caf962`](grpc/grpc-go@5caf962) client: addrConn NewStream and health check cleanup ([#2848](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2848))
- [`915d20d`](grpc/grpc-go@915d20d) grpc: change type of Server.conns
- [`7472edc`](grpc/grpc-go@7472edc) metadata: write original md before appended md ([#2879](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2879))
- [`70e8b38`](grpc/grpc-go@70e8b38) test: end2end test improvements separate server and client configs. ([#2877](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2877))
- [`e8b58ff`](grpc/grpc-go@e8b58ff) [xds_ignore_weight_0_localities] xds: ignore localities with weight 0 ([#2875](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2875))
- [`43c0599`](grpc/grpc-go@43c0599) test: fix flaky grpclb TestDropRequest ([#2865](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2865))
- [`ecb921d`](grpc/grpc-go@ecb921d) test: end2end test cleanup http handler server ([#2876](https://github-redirect.dependabot.com/grpc/grpc-go/issues/2876))
- Additional commits viewable in [compare view](grpc/grpc-go@v1.21.1...v1.22.0)
</details>
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[![Dependabot compatibility score](https://api.dependabot.com/badges/compatibility_score?dependency-name=google.golang.org/grpc&package-manager=dep&previous-version=1.21.1&new-version=1.22.0)](https://dependabot.com/compatibility-score.html?dependency-name=google.golang.org/grpc&package-manager=dep&previous-version=1.21.1&new-version=1.22.0)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

clients/go/Gopkg.toml

@@ -35,7 +35,7 @@ required = [
 
 [[constraint]]
   name = "google.golang.org/grpc"
-  version = "=1.21.1"
+  version = "=1.22.0"
 
 [[constraint]]
   name = "github.com/golang/mock"