build(deps): update dependency com.google.cloud:google-cloud-shared-config to v1.5.3 (#515)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-shared-config](https://togithub.com/googleapis/java-shared-config) | `1.5.2` -> `1.5.3` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-config/1.5.3/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-config/1.5.3/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-config/1.5.3/compatibility-slim/1.5.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-config/1.5.3/confidence-slim/1.5.2)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-shared-config</summary>

### [`v1.5.3`](https://togithub.com/googleapis/java-shared-config/blob/HEAD/CHANGELOG.md#&#8203;153-httpsgithubcomgoogleapisjava-shared-configcomparev152v153-2022-07-27)

[Compare Source](https://togithub.com/googleapis/java-shared-config/compare/v1.5.2...v1.5.3)

##### Dependencies

-   update dependency org.junit.vintage:junit-vintage-engine to v5.9.0 ([#&#8203;497](https://togithub.com/googleapis/java-shared-config/issues/497)) ([1fc6ab4](https://togithub.com/googleapis/java-shared-config/commit/1fc6ab445624cd4f9c8b161d109f346a9e5ed09a))
-   Update doclet to latest version 1.6.0 ([38fb7c3](https://togithub.com/googleapis/java-shared-config/commit/38fb7c3957fb6c9b2da10f9e463cc93a8b80a3a4))

</details>

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Author: renovate-bot

pom.xml

@@ -16,7 +16,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-shared-config</artifactId>
-    <version>1.5.2</version>
+    <version>1.5.3</version>
   </parent>
   <developers>
     <developer>