Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 661ebfbca652d8f3e25da5b519ef6261d4074650
  - 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: I556ae597f5695399e7d8b2869542a76d8c497aa3
    Signed-off-by: lf-jobbuilder <releng+lf-jobbuilder@linuxfoundation.org>
    
1 file changed