chore(deps): bump ph-schematron-maven-plugin from 5.6.5 to 6.1.0

Bumps [ph-schematron-maven-plugin](https://github.com/phax/ph-schematron) from 5.6.5 to 6.1.0.
- [Release notes](https://github.com/phax/ph-schematron/releases)
- [Commits](phax/ph-schematron@ph-schematron-parent-pom-5.6.5...ph-schematron-parent-pom-6.1.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

pom.xml

@@ -216,7 +216,7 @@
       <plugin>
         <groupId>com.helger.maven</groupId>
         <artifactId>ph-schematron-maven-plugin</artifactId>
-        <version>5.6.5</version>
+        <version>6.1.0</version>
         <executions>
           <execution>
             <goals>