Disable network-transport-tcp tests, since it should depend on network-t...

...ransport-tests-0.2.0.0 which is not released yet.

Also networkTransportTcp depends on network < 2.5.
Please don't hard-code versions in the expression itself: instead, accept `network` here and override the version to be passed to the function in `haskell-packages.nix`, like all other packages do. This practice keeps all "overrides" in one file, instead of distributing that know-how over many files.

Generally speaking, it might be worthwhile trying to add `jailbreak = true` to this build and see whether the dependency on `network < 2.5` is necessary, really. Oftentimes, these restrictions are arbitrary and can be lifted without any problem.