- move to Takari shared GH action (uses Java 11 and 17)
- move to latest released parent (but there is takari/takari-pom#12)
- move off plexus component, convert all modules to takari-maven-component packaging (JSR300)
- move off plexus logging, use Slf4j
- plexus-utils is NOT auto-injected anymore starting with Maven 3.9.0, sort it out
- fix compared POMs, locations are all now HTTPS (not HTTP)

Problems: Kotlin module fails, but am not Kotlin magician to fully fix it (140 test passes OK,
but there are 4 failures where KotlinModelWriter is about to inject MavenProject -> OutOfScopeEx

All the rest of modules should be OK, tested with Maven 3.6.3, 3.8.7 and 3.9.0.

But keep build output at Java 8 level.

As if:
* used as extension, p-u MUST NOT be present (as it is in core)
* used as plugin, p-u MUST BE present (as 3.9 does not auto-inject it anymore)

That is 2.0.8.

So copy paste and modify it here.

Compiling against it still retains compatibility with 3.6.x,
but you get latest code with latest deprecations.

One big change: serialization order changed for dependency/exclusion
element, hence order is now ga (was ag). This is merely style,
no semantic value.