Update Tycho pomless to 2.6.0 Change-Id: I69eed00e32c8d8ef8616fc18389efbfd52a81f5b Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.text/+/189876 Tested-by: Platform Bot <platform-bot@eclipse.org> Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>