Update git submodules

* Update helpcontent2 from branch 'master'
  - WIP: refactor some Python/Basic pages
    
    Change-Id: I3590e7a6e0cf62d9f9e33e8081be50ab4d0ae769
    Reviewed-on: https://gerrit.libreoffice.org/73175
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 8b1f5909

-Subproject commit eb191448f1af0dc6c3204f3fa626e9acb2d66fd2
+Subproject commit 8b1f5909975addc35b77f7009c2ee65b2e4a365d