Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to 6e4256fa4db190543ffd84a87b643c27d8591d54
  - Automation adds release-notes.rst

    Add _release_notes hook to allow automation.
    Fix non valid release notes characters in content.

    Issue-ID: CIMAN-376
    Change-Id: If2f0b5ae09d97a282d9acfd3c32971148d674a79
    Signed-off-by: lf-jobbuilder <releng+lf-jobbuilder@linuxfoundation.org>

diff --git a/docs/submodules/integration.git b/docs/submodules/integration.git
index cefa92a..6e4256f 160000 (submodule)
--- a/docs/submodules/integration.git
+++ b/docs/submodules/integration.git
@@ -1 +1 @@
-Subproject commit cefa92a7cb29a13aa09115a768672ac79020a9d6
+Subproject commit 6e4256fa4db190543ffd84a87b643c27d8591d54