• Improves developer guide for new contributors #6469 by @Nirvikalpa108
• Fixes ConcurrentModificationException while compiling Scala 2.13.4 and Java sources zinc#974 by @lefou
• Fixes -client by making it the same as --client #6500 by @Nirvikalpa108
• Fixes scripted tests for dependency-graph #6484 by @Nirvikalpa108
• Fixes metabuild ClassLoader missing util-interface #6493 by @adpi2
• Uses -Duser.home instead of $HOME to download launcher JAR #6483 by @rdesgroppes
• Fixes sbt new leaving behind target directory #6488 by @eed3si9n
• Fixes "zip END header not found" error during pushRemoteCache #6497 by @eed3si9n