deps: update dependency com.google.errorprone:error_prone_annotations to v2.9.0 (#441)

Author: renovate-bot

pom.xml

@@ -73,7 +73,7 @@
     <iam.version>1.0.14</iam.version>
     <opencensus.version>0.28.0</opencensus.version>
     <findbugs.version>3.0.2</findbugs.version>
-    <errorprone.version>2.8.1</errorprone.version>
+    <errorprone.version>2.9.0</errorprone.version>
     <jackson.version>2.12.4</jackson.version>
     <codec.version>1.15</codec.version>
     <httpcomponents.httpcore.version>4.4.14</httpcomponents.httpcore.version>