Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to c8783f0346c69d00ca686a07cb418db751598bb2
  - Sonar Fix - Removed unnecessary cast to Date
    
    Sonar Fix - Removed unnecessary cast to Date
    
    Issue-ID: APPC-1629
    Change-Id: Ie37c511ac63abd71708700b376a836e4ed03e92f
    Signed-off-by: Sudarshan Kumar <sudars19@in.ibm.com>
    
1 file changed