python3-fishnet: remove

I tried to fix/update this orphaned package, only to come to the
following realizations:

    Fishnet is now a rust package As such python3-fishnet has no
    reason to exist This package version was last updated in 2019, and
    has seen several revisions as python versions were upgraded The
    package as-is can't download stockfish, as the method for updating
    stockfish was broken in 2020

I believe the proper solution to this is to remove the package, with
no prejudice for creating fishnet based on the rust version.

Author: Patrick-Poitras

srcpkgs/python3-fishnet/files/README.voidlinux

@@ -847,6 +847,7 @@ replaces="
  python3-efl<=1.23.0_7
  python3-eliot<=1.12.0_5
  python3-envdir<=1.0.1_9
+ python3-fishnet<=1.15.18
  python3-gitchangelog<=3.0.4_7
  python3-grako<=3.99.9_7
  python3-idna-ssl<=1.1.0_3