deps: update dependency com.google.auto.value:auto-value to v1.9 (#323)

Author: renovate-bot

build.gradle

@@ -42,7 +42,7 @@ ext {
   // Shortcuts for libraries we are using
   libraries = [
       javax_annotations: 'javax.annotation:javax.annotation-api:1.3.2',
-      auto_value: 'com.google.auto.value:auto-value:1.8.2',
+      auto_value: 'com.google.auto.value:auto-value:1.9',
       auto_value_annotations: 'com.google.auto.value:auto-value-annotations:1.9',
       guava: 'com.google.guava:guava:31.0.1-jre',
       jsr305: 'com.google.code.findbugs:jsr305:3.0.2',