Bug 572099 - testBug242346 fail since I20210316-1800

Move org.eclipse.pde.build to Java 11. Its deps already do so thus it's
just stating the obvious.

Change-Id: Iac16ae81b1dbe7d7430a2794a1f3e9c29553ad46
Reviewed-on: https://git.eclipse.org/r/c/pde/eclipse.pde.build/+/179965
Tested-by: PDE Bot <pde-bot@eclipse.org>
Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>
4 files changed