Bump checker-qual from 2.5.2 to 2.11.1

Author: adangel

pom.xml

@@ -630,7 +630,7 @@
         <dependency>
             <groupId>org.checkerframework</groupId>
             <artifactId>checker-qual</artifactId>
-            <version>2.5.2</version>
+            <version>2.11.1</version>
         </dependency>
 
         <!-- We need two incompatible versions of controlsfx, one for Java 8, and one for Java 9+ -->