[Bug 261703] Mk/bsd.default-versions.mk: Switch default Python version to 3.9

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261703

--- Comment #5 from Antoine Brodin <antoine@FreeBSD.org> ---
(In reply to Thierry Thomas from comment #4)

I think that most ports mentionned in comment #1 could be fixed, for instance:

- sysutils/py-salt version 3004 works fine with python 3.9,  contrary to what
the port Makefile claims
- devel/py-aws-sam-translator does build fine with python 3.9
- devel/py-meliae was removed from a few linux distros (archlinux, debian..), 
maybe we should do the same

We could also set USE_PYTHON=allflavors to a few ports if really needed but I
would rather not do it

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