deps: update dependency com.google.cloud:grpc-gcp to v1.3.0 (#867)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:grpc-gcp](https://togithub.com/GoogleCloudPlatform/grpc-gcp-java/tree/master/grpc-gcp) ([source](https://togithub.com/GoogleCloudPlatform/grpc-gcp-java)) | `1.2.1` -> `1.3.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:grpc-gcp/1.3.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:grpc-gcp/1.3.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:grpc-gcp/1.3.0/compatibility-slim/1.2.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:grpc-gcp/1.3.0/confidence-slim/1.2.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.3.0`](https://togithub.com/GoogleCloudPlatform/grpc-gcp-java/releases/tag/v1.3.0)

[Compare Source](https://togithub.com/GoogleCloudPlatform/grpc-gcp-java/compare/v1.2.1...v1.3.0)

##### Features

-   Add switching delay to GcpMultiEndpointChannel. ([#&#8203;145](https://togithub.com/GoogleCloudPlatform/grpc-gcp-java/issues/145))
-   Look for a multi-endpoint specified in gRPC context. ([#&#8203;149](https://togithub.com/GoogleCloudPlatform/grpc-gcp-java/issues/149))

</details>

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java-shared-dependencies/first-party-dependencies/pom.xml

@@ -57,7 +57,7 @@
     <site.installationModule>${project.artifactId}</site.installationModule>
     <grpc.version>1.49.2</grpc.version>
     <gax.version>2.19.2</gax.version>
-    <grpc-gcp.version>1.2.1</grpc-gcp.version>
+    <grpc-gcp.version>1.3.0</grpc-gcp.version>
     <gson.version>2.9.1</gson.version>
     <guava.version>31.1-jre</guava.version>
     <protobuf.version>3.21.7</protobuf.version>