Downgrade f-strings to good old format strings
Switch back to ordinary format strings instead of f-strings introduced in fc6e304a, i.e. make NIFTy work again on python < 3.6.
The old module-image for the shared runners will be discontinued on October 31. All users still referencing gitlab-registry.mpcdf.mpg.de/mpcdf/module-image in their CI pipelines need to switch to the new CI images now, see instructions here.
Switch back to ordinary format strings instead of f-strings introduced in fc6e304a, i.e. make NIFTy work again on python < 3.6.