Bump auto-value.version from 1.6.3 to 1.6.6

Bumps `auto-value.version` from 1.6.3 to 1.6.6.

Updates `auto-value-annotations` from 1.6.3 to 1.6.6
- [Release notes](https://github.com/google/auto/releases)
- [Commits](google/auto@auto-value-1.6.3...auto-value-1.6.6)

Updates `auto-value` from 1.6.3 to 1.6.6
- [Release notes](https://github.com/google/auto/releases)
- [Commits](google/auto@auto-value-1.6.3...auto-value-1.6.6)

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

send-notification/pom.xml

@@ -11,7 +11,7 @@
 
     <properties>
         <slf4j.version>1.7.25</slf4j.version>
-        <auto-value.version>1.6.3</auto-value.version>
+        <auto-value.version>1.6.6</auto-value.version>
     </properties>
 
     <dependencies>