ARTEMIS-3296: get things building on Java 16 (and 17EA+21)

ARTEMIS-3296: get things building on Java 16 (and 17EA+21)

Updates parent pom, various plugins or deps, tidies up inconsistent versions
and consolidates to inherited version where possible, define properties for
some versions where not. Disables some problematic tests on JDK16+ for now.

Drops DS test dep back 1 version to remove a specific breakage affecting
multiple tests/modules, introduced after its upgrade in commit
9e70b263686ad6f0445eecf0e98dbcbf73833302.