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This PR updates the used libraries to their latest version. This includes the Gradle wrapper, too.
As both Checkstyle and PMD use SAXON in different versions now (the old Checkstyle version 7.6.1 did not use SAXON at all), this needs to be excluded for one of them to avoid conflicts. Additionally, PMD reorganized their rule handling and is going to throw a lot of warnings with old configuration files and will drop the old handling with the next major version. Therefore the included XML configuration files have been updated.