This reverts commit 913219385dfdf72232e6beefe287377cfebdfb04.
Previously build of cmake failed if 3.10 is default version of
Python. And it was worked around by limiting the range of Python to
3.6-3.9. The source of the build error is runtime error of
textproc/py-sphinx with Python 3.10. But it is already fixed and
workaround isn't necessary any more. So revert the commit
corresponding to it.
Approved by: adridg (kde@), meta (mentor), ygy (mentor)