fix(deps): update dependency io.grpc:grpc-bom to v1.51.1 (#1157)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [io.grpc:grpc-bom](https://togithub.com/grpc/grpc-java) | `1.51.0` -> `1.51.1` | [![age](https://badges.renovateapi.com/packages/maven/io.grpc:grpc-bom/1.51.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/io.grpc:grpc-bom/1.51.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/io.grpc:grpc-bom/1.51.1/compatibility-slim/1.51.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/io.grpc:grpc-bom/1.51.1/confidence-slim/1.51.0)](https://docs.renovatebot.com/merge-confidence/) |

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### ⚠ Dependency Lookup Warnings ⚠

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### Release Notes

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

### [`v1.51.1`](https://togithub.com/grpc/grpc-java/releases/tag/v1.51.1)

[Compare Source](https://togithub.com/grpc/grpc-java/compare/v1.51.0...v1.51.1)

##### Bug Fixes

-   xds: Fix ConcurrentModificationException in PriorityLoadBalancer. ([#&#8203;9744](https://togithub.com/grpc/grpc-java/issues/9744))

</details>

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gax-java/pom.xml

@@ -146,7 +146,7 @@
       <dependency>
         <groupId>io.grpc</groupId>
         <artifactId>grpc-bom</artifactId>
-        <version>1.51.0</version>
+        <version>${grpc.version}</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>
@@ -283,4 +283,4 @@
       </build>
     </profile>
   </profiles>
-</project>
+</project>