Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to a685302cf50f865cf8b22b17fbe9fe291b12a2dc
  - Ignore auto-generated file in catalog-be

    Create a gitignore file to catalog-be and add autogenerated
    file "Artifact-Generator.properties" to the ignore list.

    Change-Id: Ia482e057c56d059c9ee5dde16fd6b0419623936e
    Issue-ID: SDC-2724
    Signed-off-by: andre.schmid <andre.schmid@est.tech>

diff --git a/docs/submodules/sdc.git b/docs/submodules/sdc.git
index c6f11f2..a685302 160000 (submodule)
--- a/docs/submodules/sdc.git
+++ b/docs/submodules/sdc.git
@@ -1 +1 @@
-Subproject commit c6f11f2579e1ced27ad91f5392eacb1baedf64fb
+Subproject commit a685302cf50f865cf8b22b17fbe9fe291b12a2dc