Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to e6a4b30df9c1e712feacdacb04b205c9efd773bc
  - Fix sdc-backend image context.xml creation

    The file was not being overwritten during the build process.
    It was not changing after the first build, causing war artifact
    version problems while running the container.

    Change-Id: I8b1ab741c82f9274a2049bb4c2d1c3a8c1c8ee38
    Issue-ID: SDC-2862
    Signed-off-by: andre.schmid <andre.schmid@est.tech>

diff --git a/docs/submodules/sdc.git b/docs/submodules/sdc.git
index 9cd184e..e6a4b30 160000 (submodule)
--- a/docs/submodules/sdc.git
+++ b/docs/submodules/sdc.git
@@ -1 +1 @@
-Subproject commit 9cd184ef2b013197cd984cf881335c08a9eab01f
+Subproject commit e6a4b30df9c1e712feacdacb04b205c9efd773bc