In order to prepare the next update of Heptapod based on Gitlab 16.0. The instance will be unavailable on 2023-10-06 between 19:00 and 23:00 UTC+2
Created originally on Bitbucket by jdufresne (Jon Dufresne)
Was already merged in Bitbucket before import, marked as merged by the import user
openpyxl no longer uses subrepositories. Last one removed in 7060581473fa.
Fixes error when opening tortoise-hg, "Error loading subrepos".