Make Zinc version constant public

And use it in Javadoc

Limit 5.x compatibility in tests to JDK12 or older

Merge pull request gradle#10435 from gradle/zchase/docs-build-cache-t…

…raining-promotion

Add build cache training promotion link to selected docs

Fix resolving `DirectoryTee` elements of a `FileCollection`.

Polish release notes

Update to latest 5.6 nightly

Updates to release notes

Allow running build types for multiple subprojects at once

So we can invoke e.g. `baseServices:quickTest cli:quickTest`.

Merge pull request gradle#9788 from gradle/marc/wrapper-https-license

Use HTTPS for links to Apache license in wrapper scripts

Merge pull request gradle#9769 from gradle/marc/fix-jupiter-typos

Fix JUnit Jupiter related typos