deps: update dependency io.grpc:grpc-bom to v1.50.2 (#990)

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This PR contains the following updates:

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

@@ -158,7 +158,7 @@
     <google.auth.version>1.12.1</google.auth.version>
     <google.api.version>2.0.0</google.api.version>
     <google.http.version>1.42.2</google.http.version>
-    <grpc.version>1.50.1</grpc.version>
+    <grpc.version>1.50.2</grpc.version>
     <protobuf.version>3.21.8</protobuf.version>
     <opencensus.version>0.31.1</opencensus.version>
     <annotations-api.version>1.3.2</annotations-api.version>