update stale javadoc link

Author: fluentfuture

mug-safesql/src/main/java/com/google/mu/safesql/SafeSql.java

@@ -156,7 +156,7 @@
  *             <path>
  *               <groupId>com.google.mug</groupId>
  *               <artifactId>mug-errorprone</artifactId>
- *               <version>8.7</version>
+ *               <version>9.0</version>
  *             </path>
  *           </annotationProcessorPaths>
  *         </configuration>

mug-spanner/src/main/java/com/google/mu/spanner/ParameterizedQuery.java

@@ -122,7 +122,7 @@
  *             <path>
  *               <groupId>com.google.mug</groupId>
  *               <artifactId>mug-errorprone</artifactId>
- *               <version>8.7</version>
+ *               <version>9.0</version>
  *             </path>
  *           </annotationProcessorPaths>
  *         </configuration>