This will get EOL-ed in October (assuming it ever gets a .19 release).
We've anounced its demise on the forums in March, with a 6 months grace
period. Now that we have 3.11 on the repos, time to let this one go.
While this only removes the Python 3.8 package, and not each individual
"_python38" package we have, at least it will make it obvious we need to
change those recipes at install/update/rebuild time.
Only one recipe (not under /dev-python/) uses `python3.8` directly, and that's
for `calibre`'s TEST() (that recipe needs moving to 3.10 anyway).
So long Python 3.8!
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