Remove dependency on old network version

[Kleidukos]

This allows us to remove the flag.
Fixes #160

[hsenag]

is it necessary to do this in the same PR?

[Kleidukos]

@hsenag It would be really appreciated to move to the standard SPDX identifier for the license.

[hsenag]

sure, but does it need to be done in the same commit/PR? Particularly the Cabal version bump which could cause noise if later trying to track down some problem caused by the dependency changes.

[Kleidukos]

@hsenag Cabal version change does not cause hard-to-debug problems because it conditions what version of the cabal library (through cabal-install or stack) can parse the file. Cabal 3.0 format support is around since 2019.

But I can separate the commit, yes.

[hsenag]

I'll look into shipping this soon if nobody else gets there first.