deps: update auto-value-annotation.version to v1.8.1 (#250)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.auto.value:auto-value](https://togithub.com/google/auto) | `1.8` -> `1.8.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.auto.value:auto-value/1.8.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.auto.value:auto-value/1.8.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.auto.value:auto-value/1.8.1/compatibility-slim/1.8)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.auto.value:auto-value/1.8.1/confidence-slim/1.8)](https://docs.renovatebot.com/merge-confidence/) |
| [com.google.auto.value:auto-value-annotations](https://togithub.com/google/auto) | `1.8` -> `1.8.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.auto.value:auto-value-annotations/1.8.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.auto.value:auto-value-annotations/1.8.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.auto.value:auto-value-annotations/1.8.1/compatibility-slim/1.8)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.auto.value:auto-value-annotations/1.8.1/confidence-slim/1.8)](https://docs.renovatebot.com/merge-confidence/) |

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pom.xml

@@ -63,7 +63,7 @@
     <site.installationModule>${project.artifactId}</site.installationModule>
     <report.jxr.inherited>false</report.jxr.inherited>
     <skipITs>true</skipITs>
-    <auto-value-annotation.version>1.8</auto-value-annotation.version>
+    <auto-value-annotation.version>1.8.1</auto-value-annotation.version>
     <docRoot>/java/docs/reference/</docRoot>
   </properties>