devel/spyder: Fix runtime breakage after 716b52586

After updating devel/py-jedi to 0.19.1 [1], Spyder no longer starts
because it only accepts versions smaller than 0.19.0. Extend this limit.

[1] https://cgit.freebsd.org/ports/commit/?id=716b52586fec01517fd49e800c3a1ca2c419cdab

Approved by: maintainer (blanket for limits like this)