Pre-release version bump 2.26.0
Pre-release version bump 2.26.0

sfeltman/pygobject,pexip/pygobject,alexef/pygobject,nzjrs/pygobject,davidmalcolm/pygobject,MathieuDuponchelle/pygobject,MathieuDuponchelle/pygobject,thiblahute/pygobject,alexef/pygobject,GNOME/pygobject,MathieuDuponchelle/pygobject,Distrotech/pygobject,thiblahute/pygobject,davibe/pygobject,davidmalcolm/pygobject,jdahlin/pygobject,Distrotech/pygobject,sfeltman/pygobject,Distrotech/pygobject,choeger/pygobject-cmake,davibe/pygobject,davibe/pygobject,choeger/pygobject-cmake,pexip/pygobject,pexip/pygobject,jdahlin/pygobject,davidmalcolm/pygobject,nzjrs/pygobject,jdahlin/pygobject,nzjrs/pygobject,sfeltman/pygobject,choeger/pygobject-cmake,davibe/pygobject,GNOME/pygobject,alexef/pygobject,Distrotech/pygobject,GNOME/pygobject,thiblahute/pygobject