Update git submodules

* Update docs/submodules/vnfrqts/usecases.git from branch 'master'
  to 452d43ac202ec7d780e1b2b760ebd618f2538fd4
  - Merge "Automation adds release-notes.rst"
  - 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: I83541b502cee0a636ef3defa122cdc66c0cf1392
    Signed-off-by: lf-jobbuilder <releng+lf-jobbuilder@linuxfoundation.org>

diff --git a/docs/submodules/vnfrqts/usecases.git b/docs/submodules/vnfrqts/usecases.git
index aec3478..452d43a 160000 (submodule)
--- a/docs/submodules/vnfrqts/usecases.git
+++ b/docs/submodules/vnfrqts/usecases.git
@@ -1 +1 @@
-Subproject commit aec34780cd40ef722d992a4073c6a5090d9024b6
+Subproject commit 452d43ac202ec7d780e1b2b760ebd618f2538fd4