[bug#40588] [PATCH] gnu: fish: Upgrade to 3.1.0.

[John Soo]

Hi Guix,

Fish shell had a large minor release a couple months ago. Here are the
patches to use the updated version.

It features a cmake build system, an extensive test suite and a lot of
new features and bug fixes.

I also include what I think might be a patch to export some variables
that should be exposed all the time but I am not sure.  That patch might
not be desirable to have on master yet, as it is mostly my research into
issue #30265.

Thanks!

John

0001-gnu-fish-export-extra-directories.patch
Description: export-extra-directories

0002-gnu-fish-Upgrade-to-3.1.0.patch
Description: upgrade-fish