deps: update dependency com.google.errorprone:error_prone_annotations…

… to v2.8.1 (#426)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.errorprone:error_prone_annotations](https://errorprone.info) ([source](https://github.com/google/error-prone)) | `2.8.0` -> `2.8.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.errorprone:error_prone_annotations/2.8.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.errorprone:error_prone_annotations/2.8.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.errorprone:error_prone_annotations/2.8.1/compatibility-slim/2.8.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.errorprone:error_prone_annotations/2.8.1/confidence-slim/2.8.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>google/error-prone</summary>

### [`v2.8.1`](https://github.com/google/error-prone/compare/v2.8.0...v2.8.1)

[Compare Source](https://github.com/google/error-prone/compare/v2.8.0...v2.8.1)

</details>

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### Configuration

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pom.xml

@@ -74,7 +74,7 @@
     <iam.version>1.0.14</iam.version>
     <opencensus.version>0.28.0</opencensus.version>
     <findbugs.version>3.0.2</findbugs.version>
-    <errorprone.version>2.8.0</errorprone.version>
+    <errorprone.version>2.8.1</errorprone.version>
     <jackson.version>2.12.4</jackson.version>
     <codec.version>1.15</codec.version>
     <httpcomponents.httpcore.version>4.4.14</httpcomponents.httpcore.version>