chore(deps): update dependency com.google.firebase:firebase-admin to v8.1.0 (#6061)
chore(deps): update dependency com.google.firebase:firebase-admin to v8.1.0 (#6061)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.firebase:firebase-admin](https://firebase.google.com/) ([source](https://togithub.com/firebase/firebase-admin-java)) | `8.0.1` -> `8.1.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.firebase:firebase-admin/8.1.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.firebase:firebase-admin/8.1.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.firebase:firebase-admin/8.1.0/compatibility-slim/8.0.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.firebase:firebase-admin/8.1.0/confidence-slim/8.0.1)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>firebase/firebase-admin-java</summary>

### [`v8.1.0`](https://togithub.com/firebase/firebase-admin-java/releases/v8.1.0)

[Compare Source](https://togithub.com/firebase/firebase-admin-java/compare/v8.0.1...v8.1.0)

##### New Features

-   feat(rc): Add Remote Config Parameter Value Type support ([#&#8203;591](https://togithub.com/firebase/firebase-admin-java/issues/591))

##### Bug Fixes

-   fix: FirebaseOptions: move default initialization from Builder ([#&#8203;592](https://togithub.com/firebase/firebase-admin-java/issues/592))
-   fix: Using AuthorizedHttpClient for updating rules during tests ([#&#8203;590](https://togithub.com/firebase/firebase-admin-java/issues/590))

##### Miscellaneous

-   \[chore] Release 8.1.0 ([#&#8203;599](https://togithub.com/firebase/firebase-admin-java/issues/599))
-   Update custom Doclet configuration for javadoc ([#&#8203;587](https://togithub.com/firebase/firebase-admin-java/issues/587))
-   chore(deps): bump netty.version from 4.1.66.Final to 4.1.67.Final ([#&#8203;588](https://togithub.com/firebase/firebase-admin-java/issues/588))

</details>

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