FromCabal.Name: fix libsoup attribute names

`pkgconfig-depends: libsoup-3.0` was being incorrectly resolved to `libsoup` attribute. Additionally, NixOS/nixpkgs#360908 renamed `libsoup` attribute to `libsoup_2_4`.

Let’s use the correct package attribute names for all libsoup pkg-config files. All libsoup dependent Haskell-packages use `pkgconfig-depends` with one of those names:

https://hackage.haskell.org/package/gi-soup-3.0.3/src/gi-soup.cabal
https://hackage.haskell.org/package/gi-soup-2.4.29/src/gi-soup.cabal
https://hackage.haskell.org/package/spike-0.3/src/spike.cabal

Author: jtojnar

cabal2nix/src/Distribution/Nixpkgs/Haskell/FromCabal/Name.hs

@@ -120,7 +120,9 @@ libNixName "libpcre2-8"                         = libNixName "libpcre2"
 libNixName "libqrencode"                        = return "qrencode"
 libNixName "libR"                               = return "R"
 libNixName "libsecp256k1"                       = return "secp256k1"
-libNixName "libsoup-gnome-2.4"                  = return "libsoup"
+libNixName "libsoup-2.4"                        = return "libsoup_2_4"
+libNixName "libsoup-gnome-2.4"                  = return "libsoup_2_4"
+libNixName "libsoup-3.0"                        = return "libsoup_3"
 libNixName "libsystemd"                         = return "systemd"
 libNixName "libudev"                            = return "systemd"
 libNixName "libxml-2.0"                         = return "libxml2"