Update git submodules

* Update helpcontent2 from branch 'master'
  - added hasUnoInterfaces()
    
    Change-Id: I41e521c34c4dbf161b0bd4316da75d6db7ec4314
    Reviewed-on: https://gerrit.libreoffice.org/71214
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 4ee8b6f4

-Subproject commit f52790876dae6ffe59fd71bf5f59df33678f0b5a
+Subproject commit 4ee8b6f4751bd71333c93756474148cfa7afc750