Bump checkstyle from 9.2.1 to 9.3 (apache#90)

Author: garydgregory

src/changes/changes.xml

@@ -102,7 +102,7 @@
        Bump maven-checkstyle-plugin from 2.15 to 3.1.2 #41.
      </action>
      <action type="update" dev="ggregory" due-to="Gary Gregory">
-       Bump checkstyle to 9.2.1 #68, #86.
+       Bump checkstyle to 9.3 #68, #86, #90.
      </action>
      <action type="update" dev="ggregory" due-to="Dependabot">
        Bump actions/cache from 2 to 2.1.7 #64, #65, #81.