Upgrade Google Java Format 1.19.2 -> 1.20.0 (#1050)

See:
- https://github.com/google/google-java-format/releases/tag/v1.20.0
- google/google-java-format@v1.19.2...v1.20.0

pom.xml

@@ -328,7 +328,7 @@
             <dependency>
                 <groupId>com.google.googlejavaformat</groupId>
                 <artifactId>google-java-format</artifactId>
-                <version>1.19.2</version>
+                <version>1.20.0</version>
             </dependency>
             <dependency>
                 <groupId>com.google.guava</groupId>