Otherwise DownloadAction might assume,
that the destination is actually a file,
when just one file is requested
(which is true for some POM only compose modules)
* Fix compatibility with Intellij 2021.3
Resolves#1373
* Use Java reflection
* Set Java source & target compatibility for build helpers
Otherwise, Gradle might set Gradle metadata attributes in such way,
that transitive dependencies of published modules are not resolved
* Configure shadow jar manually
Applying plugin configures additional publication,
so that both .jar and -shadow.jar are published,
and additional configurations are added to Gradle metadata.
To avoid unexpected metadata resolution results,
ShadowJar task is now configured manually
* Fix closeStagingRepo JSON request
* Update publishing build-helpers in compose
