Update git submodules

* Update helpcontent2 from branch 'master'
  - Help files: http -> https
    
    + some more conservative changes
    
    Change-Id: I4176d10e185e88217455a72e7e6b5910ff970b0f
    Reviewed-on: https://gerrit.libreoffice.org/63215
    Tested-by: Jenkins
Reviewed-by: Sophie Gautier <gautier.sophie@gmail.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
    

helpcontent2 @ 07d6d954

-Subproject commit ab5c2340fcb35813db7777460fe851ae5b49c9b3
+Subproject commit 07d6d9548446b022fe319b898bf7ab6f64f7ed98