deps: update dependency com.google.auth:google-auth-library-oauth2-http to v1.8.1 (#385)

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

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>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, click this checkbox.

---

This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/java-iam).

Author: renovate-bot

iam/cloud-client/snippets/pom.xml

@@ -31,7 +31,7 @@
     <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.http-client</groupId>