Update git submodules

* Update helpcontent2 from branch 'libreoffice-6-2'
  - REGEX: correct ICU URL to use http, not https (which seems unavailable)
    
    Change-Id: Iaeed0d81dc88418c2bffab730fd682ca8cb3b101
    Reviewed-on: https://gerrit.libreoffice.org/64313
    Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>
    (cherry picked from commit f9566b6655aad0408724c4df65178f43c3e3d4f8)
    Reviewed-on: https://gerrit.libreoffice.org/64400
    

helpcontent2 @ 0afeaf5e

-Subproject commit ee142eec43e73bac7377380c3c72c31600a20355
+Subproject commit 0afeaf5e8ace28ccb5365ffdc763197f8084fb50