JCR-5115: Update spotbugs-maven-plugin to 4.8.6.4

Author: reschke

jackrabbit-parent/pom.xml

@@ -424,7 +424,7 @@
       <plugin>
         <groupId>com.github.spotbugs</groupId>
         <artifactId>spotbugs-maven-plugin</artifactId>
-        <version>4.8.6.2</version>
+        <version>4.8.6.4</version>
       </plugin>
     </plugins>
   </reporting>