deps: update dependency com.google.errorprone:error_prone_annotations to v2.4.0

Author: renovate-bot

pom.xml

@@ -162,7 +162,7 @@
  <threeten.version>1.4.4</threeten.version>
  <javax.annotations.version>1.3.2</javax.annotations.version>
  <animal-sniffer.version>1.18</animal-sniffer.version>
- <errorprone.version>2.3.4</errorprone.version>
+ <errorprone.version>2.4.0</errorprone.version>
  </properties>
 
  <dependencyManagement>