Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to 6ff5f15cd520b2414768b12ecc3cd4638b200352
  - Remove powermock from ArtifactValidationUtilsTest

    - Remove powermock reference from ArtifactValidationUtilsTest
    - Use junit 5 imports instead of junit 4

    Issue-ID: SDC-3067
    Signed-off-by: Rodrigo Lima  <rodrigo.lima@yoppworks.com>
    Change-Id: I6388e133024ed1e7604e90fc24ba3e84a33da4f7

diff --git a/docs/submodules/sdc.git b/docs/submodules/sdc.git
index 3e6caca..6ff5f15 160000 (submodule)
--- a/docs/submodules/sdc.git
+++ b/docs/submodules/sdc.git
@@ -1 +1 @@
-Subproject commit 3e6caca29ecf74b0bacdfc7f20990e9820fc987d
+Subproject commit 6ff5f15cd520b2414768b12ecc3cd4638b200352