Update git submodules

Update git submodules

* Update docs/submodules/ccsdk/cds.git from branch 'dublin'
  to 6c2ce9e3eee61fd9ec84594c0284f6d5b94fa925
  - Fixing restconf_client.py script

    The restconf_client.py script uses BlueprintWebClientService to send
    REST requests to ODL. When the methods of that interface have the type
    of the returns changed from String to WebClientResponse, the script
    stopped working.

    This fix changes the way the response is manipulated, to act upon a
    WebClientResponse and not on a String

    Change-Id: I3876c5b27d65058f0b5b77da17f9225fc04779c6
    Issue-ID: CCSDK-1384
    Signed-off-by: ottero <rodrigo.ottero@est.tech>