Hardens `PropertiesUtil` against recursive property sources#3263

ppkarwasz merged 5 commits into2.24.xapache/logging-log4j2:2.24.xfrom

fix/2.24.x/3252_recursive_property_sourceapache/logging-log4j2:fix/2.24.x/3252_recursive_property_sourceCopy head branch name to clipboard