deps: update dependency io.grpc:grpc-protobuf to v1.50.0 (#476)

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [io.grpc:grpc-protobuf](https://github.com/grpc/grpc-java) | `1.49.2` -> `1.50.0` | [![age](https://badges.renovateapi.com/packages/maven/io.grpc:grpc-protobuf/1.50.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/io.grpc:grpc-protobuf/1.50.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/io.grpc:grpc-protobuf/1.50.0/compatibility-slim/1.49.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/io.grpc:grpc-protobuf/1.50.0/confidence-slim/1.49.2)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>grpc/grpc-java</summary>

### [`v1.50.0`](https://github.com/grpc/grpc-java/releases/tag/v1.50.0)

#### New Features

-   okhttp: Added connection management features to okhttp server, including maxConnectionIdle(),  permitKeepAliveTime(), and permitKeepAliveWithoutCalls() ([#&#8203;9494](https://github.com/grpc/grpc-java/issues/9494), [#&#8203;9544](https://github.com/grpc/grpc-java/issues/9544))
-   binder: Add `SecurityPolicies` for checking device owner/profile owner ([#&#8203;9428](https://github.com/grpc/grpc-java/issues/9428))

#### API Changes

-   api: Add LoadBalancer.acceptResolvedAddresses() ([#&#8203;9498](https://github.com/grpc/grpc-java/issues/9498)). The method is like `handleResolvedAddresses()` but returns a `boolean` of whether the addresses and configuration were accepted. Not accepting the update triggers the NameResolver to retry after a delay. We are not yet encouraging migration to this method, as there is still a second future API change
-   core: add CallOptions to CallCredentials.RequestInfo ([#&#8203;9538](https://github.com/grpc/grpc-java/issues/9538))

#### Bug Fixes

-   auth: Fix AppEngine failing while retrieving access token when instantiating a blocking stub using AppEngineCredentials ([#&#8203;9504](https://github.com/grpc/grpc-java/issues/9504))
-   core: Ensure that context cancellationCause is set ([#&#8203;9501](https://github.com/grpc/grpc-java/issues/9501))
-   core: Update outlier detection max ejection logic to allow exceeding the limit by one, to match Envoy. ([#&#8203;9489](https://github.com/grpc/grpc-java/issues/9489), [#&#8203;9492](https://github.com/grpc/grpc-java/issues/9492))
-   core: outlier detection to honor min host request volume ([#&#8203;9490](https://github.com/grpc/grpc-java/issues/9490))
-   okhttp: Add timeout for HTTP CONNECT proxy handshake ([#&#8203;9586](https://github.com/grpc/grpc-java/issues/9586))
-   xds: ringhash policy in TRANSIENT_FAILURE should not attempt connecting when already in connecting ([#&#8203;9535](https://github.com/grpc/grpc-java/issues/9535)). With workloads where most requests have the same hash, ring hash should behave more like pick-first of slowly trying backends

#### Dependencies

-   netty: upgrade netty from 4.1.77.Final to 4.1.79.Final and tcnative from 2.0.53 to 2.0.54 ([#&#8203;9451](https://github.com/grpc/grpc-java/issues/9451))

#### Acknowledgements

[@&#8203;cpovirk](https://github.com/cpovirk)
[@&#8203;prateek-0](https://github.com/prateek-0)
[@&#8203;sai-sunder-s](https://github.com/sai-sunder-s)

</details>

---

### Configuration

📅 **Schedule**: 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 this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, click this checkbox.

---

This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/java-iam).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzMi4yMzIuMCIsInVwZGF0ZWRJblZlciI6IjMyLjIzOC40In0=-->

java-iam/grpc-google-iam-v1/build.gradle

@@ -19,7 +19,7 @@ repositories {
 
 dependencies {
   compile 'io.grpc:grpc-stub:1.49.2'
-  compile 'io.grpc:grpc-protobuf:1.49.2'
+  compile 'io.grpc:grpc-protobuf:1.50.0'
   compile project(':proto-google-iam-v1')
 }