config: bump checkstyle to 9.1 version

Author: romani

eclipsecs-sevntu-plugin/pom.xml

@@ -26,7 +26,7 @@
   </licenses>
 
   <properties>
-    <eclipsecs.version>8.44.0-SNAPSHOT</eclipsecs.version>
+    <eclipsecs.version>9.1.0-SNAPSHOT</eclipsecs.version>
   </properties>
 
   <dependencies>

sevntu-checks/pom.xml

@@ -16,7 +16,7 @@
   <properties>
     <project.build.sourceEncoding>iso-8859-1</project.build.sourceEncoding>
     <!-- It is compile dependency to checkstyle, this version has to be the same as eclipse-cs depends on -->
-    <checkstyle.eclipse-cs.version>8.44</checkstyle.eclipse-cs.version>
+    <checkstyle.eclipse-cs.version>9.1</checkstyle.eclipse-cs.version>
     <!-- verify time version -->
     <checkstyle.version>9.2.1</checkstyle.version>
     <checkstyle.configLocation>https://raw.githubusercontent.com/checkstyle/checkstyle/checkstyle-${checkstyle.version}/config/checkstyle_checks.xml</checkstyle.configLocation>