Update git submodules

* Update docs/submodules/optf/has.git from branch 'master'
  to 5d8d60c806266d38baf7ba6c63acb5f49d38b1ab
  - Dockerfile updated to use python 3.8
    
    Issue-ID: OPTFRA-645
    Signed-off-by: Ikramullah, Ikram <ikram@research.att.com>
    Change-Id: Ic9ff68036e53feb7938006d4caaf489a23530c7c
    
1 file changed