Update git submodules

* Update docs/submodules/aaf/authz.git from branch 'master'
  to 6216814d263834a61708ec1cf002365f4ad6f969
  - fix: stage a release candidate for 2.1.20
    
    Issue-ID: AAF-1124
    Signed-off-by: John J. Franey <john.franey@att.com>
    Change-Id: I401b5b5c6589757d15027e0ad4b96f0061016be9
    
1 file changed