deps: update dependency com.google.errorprone:error_prone_annotations to v2.8.0 (googleapis#492)

Author: renovate-bot

pom.xml

@@ -169,7 +169,7 @@
  <findbugs.version>3.0.2</findbugs.version>
  <threetenbp.version>1.5.1</threetenbp.version>
  <objenesis.version>2.6</objenesis.version>
- <errorprone.version>2.7.1</errorprone.version>
+ <errorprone.version>2.8.0</errorprone.version>
  <gson.version>2.8.7</gson.version>
  </properties>