HPCC-11054 Switch submodule references to HTTPS (from SSH)

The SSH protocol requires users to create and register a SSH key with github
which is inconvenient for non contributors.

Fixes HPCC-11054

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #5558 from GordonSmith/HPCC-11054

HPCC-11054 Switch submodule references to HTTPS (from SSH)

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>