Bump auto-value-annotations from 1.8.2 to 1.9

Bumps [auto-value-annotations](https://github.com/google/auto) from 1.8.2 to 1.9.
- [Release notes](https://github.com/google/auto/releases)
- [Commits](google/auto@auto-value-1.8.2...auto-value-1.9)

---
updated-dependencies:
- dependency-name: com.google.auto.value:auto-value-annotations
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -23,7 +23,7 @@
     <maven-enforcer-plugin.version>3.0.0</maven-enforcer-plugin.version>
 
     <!-- Properties for multiple-artifact deps. -->
-    <auto-value.version>1.8.2</auto-value.version>
+    <auto-value.version>1.9</auto-value.version>
     <!--
       We have a separate property for each flavor of Guava (instead of a shared
       version without the -android and -jre suffixes) because that lets