fix(deps): update dependency com.google.testing.compile:compile-testing to v0.21.0

Author: renovate[bot]

dependencies/pom.xml

@@ -72,7 +72,7 @@
       <dependency>
         <groupId>com.google.testing.compile</groupId>
         <artifactId>compile-testing</artifactId>
-        <version>0.19</version>
+        <version>0.21.0</version>
       </dependency>
       <dependency>
         <groupId>com.google.auto</groupId>