Use pmd 7.0.0-rc4

Author: adangel

pom.xml

@@ -21,7 +21,7 @@
     <!-- https://github.com/eclipse/tycho/blob/master/RELEASE_NOTES.md and https://github.com/eclipse-tycho/tycho/releases -->
     <tycho.version>3.0.4</tycho.version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <pmd.version>7.0.0-SNAPSHOT</pmd.version>
+    <pmd.version>7.0.0-rc4</pmd.version>
     <pmd.build-tools.version>22</pmd.build-tools.version>
     <checkstyle.version>10.7.0</checkstyle.version>
     <checkstyle.plugin.version>3.2.2</checkstyle.plugin.version>