Merge pull request #820 from eXist-db/dependabot/maven/com.helger.maven-ph-schematron-maven-plugin-6.3.3

chore(deps): bump ph-schematron-maven-plugin from 6.3.1 to 6.3.3

Author: joewiz

pom.xml

@@ -246,7 +246,7 @@
       <plugin>
         <groupId>com.helger.maven</groupId>
         <artifactId>ph-schematron-maven-plugin</artifactId>
-        <version>6.3.1</version>
+        <version>6.3.3</version>
         <executions>
           <execution>
             <goals>