HPCC-9071 Language version increased to 4.0.0

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #4193 from ghalliday/issue9071

HPCC-9071 Language version increased to 4.0.0

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>