test(deps): update dependency io.grpc:protoc-gen-grpc-java to v1.57.0 (…

…#1869)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [io.grpc:protoc-gen-grpc-java](https://togithub.com/grpc/grpc-java) | `1.56.1` -> `1.57.0` | [![age](https://developer.mend.io/api/mc/badges/age/maven/io.grpc:protoc-gen-grpc-java/1.57.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/io.grpc:protoc-gen-grpc-java/1.57.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/io.grpc:protoc-gen-grpc-java/1.56.1/1.57.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/io.grpc:protoc-gen-grpc-java/1.56.1/1.57.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>grpc/grpc-java (io.grpc:protoc-gen-grpc-java)</summary>

### [`v1.57.0`](https://togithub.com/grpc/grpc-java/compare/v1.56.1...v1.57.0)

</details>

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### Configuration

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README.md

@@ -50,7 +50,7 @@ If you are using Maven without the BOM, add this to your dependencies:
 If you are using Gradle 5.x or later, add this to your dependencies:
 
 ```Groovy
-implementation platform('com.google.cloud:libraries-bom:26.19.0')
+implementation platform('com.google.cloud:libraries-bom:26.20.0')
 
 implementation 'com.google.cloud:google-cloud-bigtable'
 ```

google-cloud-bigtable/pom.xml

@@ -38,7 +38,7 @@
     <bigtable.cfe-data-batch-endpoint>batch-bigtable.googleapis.com:443</bigtable.cfe-data-batch-endpoint>
 
     <!-- These are needed to compile the protobuf used by Changestream merging acceptance test. -->
-    <test-protoc-grpc.version>1.56.1</test-protoc-grpc.version>
+    <test-protoc-grpc.version>1.57.0</test-protoc-grpc.version>
     <test-protoc.version>3.23.4</test-protoc.version>
   </properties>