Upgrade to 2.4.2 release of RCPTT test framework.
Upgrade to 2.4.2 release of RCPTT test framework.

The previously referenced framework has already been deleted
from repo.eclipse.org breaking the build for contributors.

[Tests][RCPTT]
lemmy/tlaplus,lemmy/tlaplus,lemmy/tlaplus,tlaplus/tlaplus,lemmy/tlaplus,tlaplus/tlaplus,tlaplus/tlaplus,tlaplus/tlaplus