deps: update dependency com.google.errorprone:error_prone_annotations to v2.8.1 (#789)

Author: renovate-bot

pom.xml

@@ -39,7 +39,7 @@
  <dependency>
  <groupId>com.google.errorprone</groupId>
  <artifactId>error_prone_annotations</artifactId>
- <version>2.8.0</version>
+ <version>2.8.1</version>
  </dependency>
  <dependency>
  <groupId>com.google.auto.service</groupId>