deps: update dependency com.google.cloud:google-cloud-game-servers-bom to v2.3.0 (#4678)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-game-servers-bom](https://togithub.com/googleapis/java-game-servers) | `2.2.1` -> `2.3.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-game-servers-bom/2.3.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-game-servers-bom/2.3.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-game-servers-bom/2.3.0/compatibility-slim/2.2.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-game-servers-bom/2.3.0/confidence-slim/2.2.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-game-servers</summary>

### [`v2.3.0`](https://togithub.com/googleapis/java-game-servers/blob/HEAD/CHANGELOG.md#&#8203;230-httpsgithubcomgoogleapisjava-game-serverscomparev221v230-2022-07-01)

[Compare Source](https://togithub.com/googleapis/java-game-servers/compare/v2.2.1...v2.3.0)

##### Features

-   Enable REST transport for most of Java and Go clients ([#&#8203;676](https://togithub.com/googleapis/java-game-servers/issues/676)) ([aa517be](https://togithub.com/googleapis/java-game-servers/commit/aa517bef9cb58d15eb22cf80d24fce2d8bd8090d))

##### Bug Fixes

-   update gapic-generator-java with mock service generation fixes ([#&#8203;682](https://togithub.com/googleapis/java-game-servers/issues/682)) ([8866d04](https://togithub.com/googleapis/java-game-servers/commit/8866d0413d6c4bc33e078971e5c2d38f8016b7d1))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -462,7 +462,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-game-servers-bom</artifactId>
-        <version>2.2.1</version>
+        <version>2.3.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>