Fixup 92abdcca

Revert an accidental update of ColumnStore.
A different submodule is being used between MariaDB 10.5 and 10.6.
The submodule was accidentally updated to the 10.5 version in the merge.

columnstore @ f6f91f54

-Subproject commit ea708da6e30fd579c5fb4b6cecb3c06d4649418d
+Subproject commit f6f91f543283e077e3300a987c56b051435d3192