deps: update dependency com.google.auth:google-auth-library-bom to v0.25.5 (#435)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.auth:google-auth-library-bom](https://togithub.com/googleapis/google-auth-library-java) | `0.25.4` -> `0.25.5` | [![age](https://badges.renovateapi.com/packages/maven/com.google.auth:google-auth-library-bom/0.25.5/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.auth:google-auth-library-bom/0.25.5/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.auth:google-auth-library-bom/0.25.5/compatibility-slim/0.25.4)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.auth:google-auth-library-bom/0.25.5/confidence-slim/0.25.4)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/google-auth-library-java</summary>

### [`v0.25.5`](https://togithub.com/googleapis/google-auth-library-java/blob/master/CHANGELOG.md#&#8203;0255-httpswwwgithubcomgoogleapisgoogle-auth-library-javacomparev0254v0255-2021-04-22)

[Compare Source](https://togithub.com/googleapis/google-auth-library-java/compare/v0.25.4...v0.25.5)

</details>

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java-core/pom.xml

@@ -155,7 +155,7 @@
     <google.api-common.version>1.10.3</google.api-common.version>
     <google.common-protos.version>2.1.0</google.common-protos.version>
     <google.iam.version>1.0.12</google.iam.version>
-    <google.auth.version>0.25.4</google.auth.version>
+    <google.auth.version>0.25.5</google.auth.version>
     <google.api.version>1.31.4</google.api.version>
     <google.http.version>1.39.2</google.http.version>
     <grpc.version>1.37.0</grpc.version>