Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: Set content-type of promotion properties file to text/html

    Change-Id: I609b796c629c68df214634ced5e9e6bda8ac2607
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index a0df693..058009d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit a0df693b4e7d567adec158f6cc11b5b7cdadf564
+Subproject commit 058009d0462e11754888b7ae51b9c08fa8f0487f