Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: Disable voting for CentOS jobs

    CentOS jobs started failing which requires troubleshooting.
    In order not to block things, the voting is disabled for CentOS jobs.

    Change-Id: Idc14b00cf09f0ee75bac17e993dc9f7724a1ad88
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 8150d3c..0b4524b 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 8150d3cc0157e15003cf0e6e99fcf50db386bef2
+Subproject commit 0b4524bfcd0e406687e2053cf7ef9913b606f635