Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Re-enabling docs jobs for Danube"
  - Re-enabling docs jobs for Danube

    The danube jobs are still needed for ongoing Dovetail documentation
    efforts.

    Change-Id: Ibf7174a63693d7c141cf110f6fbcfac4437102c9
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index bba9d47..4b895cc 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit bba9d47d826283461ee31a6c437e537f0a93d827
+Subproject commit 4b895cc5bff1804ecb72171b78fe55cd25fd33a9