fix(deps): update dependency com.google.auth:google-auth-library-oauth2-http to v1.8.1 (#1738)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.auth:google-auth-library-oauth2-http](https://togithub.com/googleapis/google-auth-library-java) | `1.8.0` -> `1.8.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.auth:google-auth-library-oauth2-http/1.8.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.auth:google-auth-library-oauth2-http/1.8.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.auth:google-auth-library-oauth2-http/1.8.1/compatibility-slim/1.8.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.auth:google-auth-library-oauth2-http/1.8.1/confidence-slim/1.8.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v1.8.1`](https://togithub.com/googleapis/google-auth-library-java/blob/HEAD/CHANGELOG.md#&#8203;181-httpsgithubcomgoogleapisgoogle-auth-library-javacomparev180v181-2022-07-13)

[Compare Source](https://togithub.com/googleapis/google-auth-library-java/compare/v1.8.0...v1.8.1)

##### Bug Fixes

-   enable longpaths support for windows test ([#&#8203;1485](https://togithub.com/googleapis/google-auth-library-java/issues/1485)) ([#&#8203;943](https://togithub.com/googleapis/google-auth-library-java/issues/943)) ([c21ec6c](https://togithub.com/googleapis/google-auth-library-java/commit/c21ec6c952b8bb8fb8bc2e2f1b260beb330a3cd2))

</details>

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pom.xml

@@ -71,7 +71,7 @@
       <dependency>
         <groupId>com.google.auth</groupId>
         <artifactId>google-auth-library-oauth2-http</artifactId>
-        <version>1.8.0</version>
+        <version>1.8.1</version>
       </dependency>
       <dependency>
         <groupId>com.google.code.findbugs</groupId>