Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - xci: Bump SHAs to the latest stable/queens

    Rocky is still in early stages of development so bump SHAs to the
    latest version for Queens.

    Change-Id: I0721e6188889c3548c266c042414397385b85ca2
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 48f69ec..df68b8f 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 48f69ecec639c9b7e0076ccd13f87fe23b2123a7
+Subproject commit df68b8fd82b95a04d14d0d3a87c436f3fb6b0edb