maintainer-feedback requested: [Bug 258798] devel/cmake: Revert "fix build with python 3.10 as default"

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-kde (Team)
<kde at FreeBSD.org> for maintainer-feedback:
Bug 258798: devel/cmake: Revert "fix build with python 3.10 as default"
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258798



--- Description ---
This reverts ports 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.