Bump cabal format version

Author: alexfmpe

cabal2nix/cabal2nix.cabal

@@ -1,3 +1,4 @@
+cabal-version:      2.2
 name:               cabal2nix
 version:            2.21.3
 synopsis:           Convert Cabal files into Nix build instructions.
@@ -6,7 +7,7 @@ description:
   version by running:
   .
   > nix-env -i cabal2nix
-license:            BSD3
+license:            BSD-3-Clause
 license-file:       LICENSE
 author:             Peter Simons <simons@cryp.to>
 -- list all contributors: git log --pretty='%an' | sort | uniq
@@ -21,7 +22,6 @@ extra-doc-files:    README.md
                     CHANGELOG.md
 extra-source-files: test/golden-test-cases/*.cabal
                     test/golden-test-cases/*.nix.golden
-cabal-version:      1.24
 
 source-repository head
   type:     git
@@ -134,5 +134,5 @@ test-suite regression-test
                     , tasty
                     , tasty-golden
   default-language:   Haskell2010
-  build-tools:        cabal2nix
+  build-tool-depends: cabal2nix:cabal2nix
   ghc-options:        -threaded -with-rtsopts=-K64K

distribution-nixpkgs/distribution-nixpkgs.cabal

@@ -1,8 +1,9 @@
+cabal-version: 2.2
 name:          distribution-nixpkgs
 version:       1.7.1.1
 synopsis:      Types and functions to manipulate the Nixpkgs distribution
 description:   Types and functions to represent, query, and manipulate the Nixpkgs distribution.
-license:       BSD3
+license:       BSD-3-Clause
 license-file:  LICENSE
 author:        Peter Simons <simons@cryp.to>
 maintainer:    sternenseemann <sternenseemann@systemli.org>
@@ -11,7 +12,6 @@ category:      Distribution, Nix
 homepage:      https://github.com/NixOS/cabal2nix/tree/master/distribution-nixpkgs#readme
 bug-reports:   https://github.com/NixOS/cabal2nix/issues
 build-type:    Simple
-cabal-version: 1.18
 data-files:    derivation-attr-paths.nix
 extra-doc-files:    CHANGELOG.md
                     README.md

language-nix/language-nix.cabal

@@ -1,9 +1,10 @@
+cabal-version: 2.2
 name:          language-nix
 version:       2.3.0
 synopsis:      Data types and functions to represent the Nix language
 description:   Data types and useful functions to represent and manipulate the Nix
                language.
-license:       BSD3
+license:       BSD-3-Clause
 license-file:  LICENSE
 author:        Peter Simons
 maintainer:    simons@cryp.to
@@ -12,7 +13,6 @@ category:      Distribution, Language, Nix
 homepage:      https://github.com/NixOS/cabal2nix/tree/master/language-nix#readme
 bug-reports:   https://github.com/NixOS/cabal2nix/issues
 build-type:    Simple
-cabal-version: 1.18
 extra-doc-files: README.md
                  CHANGELOG.md