Update git submodules

* Update helpcontent2 from branch 'master'
  - Help files: http -> https
    
    + some more conservative changes
    
    Change-Id: I6f7e22164c975421f01e9ba974d82f14a34c0d5d
    Reviewed-on: https://gerrit.libreoffice.org/63219
    Tested-by: Jenkins
Reviewed-by: Sophie Gautier <gautier.sophie@gmail.com>
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 9077e33a

-Subproject commit 06c18977efb48ac01627c139a70ae70008319f62
+Subproject commit 9077e33a902ac32266b88516c91e4fc04fd23419