chore(deps): Update dependency net.sourceforge.pmd:pmd-java to v7.20.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -9,7 +9,7 @@ indra = "3.2.0"
 junit="5.14.0"
 ktlint="0.49.1"
 ktfmt="0.61"
-pmd = "7.16.0"
+pmd = "7.20.0"
 spotless = "8.2.0"
 
 [libraries]