chore(deps): update dependency io.grpc:grpc-core to v1.50.2 (#1841)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [io.grpc:grpc-core](https://togithub.com/grpc/grpc-java) | `1.50.1` -> `1.50.2` | [![age](https://badges.renovateapi.com/packages/maven/io.grpc:grpc-core/1.50.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/io.grpc:grpc-core/1.50.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/io.grpc:grpc-core/1.50.2/compatibility-slim/1.50.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/io.grpc:grpc-core/1.50.2/confidence-slim/1.50.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.50.2`](https://togithub.com/grpc/grpc-java/releases/tag/v1.50.2)

[Compare Source](https://togithub.com/grpc/grpc-java/compare/v1.50.1...v1.50.2)

##### Bug fixes

gcp-observability: Supports period(.) in the service name part of regular expression for a fully-qualified method to accept "package.service"

</details>

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dependencies.properties

@@ -25,7 +25,7 @@ version.gax_httpjson=0.104.4
 # with the sources.
 version.com_google_protobuf=3.21.7
 version.google_java_format=1.15.0
-version.io_grpc=1.50.1
+version.io_grpc=1.50.2
 
 # Maven artifacts.
 # Note, the actual name of each property matters (bazel build scripts depend on it).