Move 'cabal-version' to the start of the file, now required

cabal-benchmarks/cabal-benchmarks.cabal

+cabal-version:      2.2
 name:               cabal-benchmarks
 version:            3
 copyright:          2003-2022, Cabal Development Team (see AUTHORS file)
@@ -12,7 +13,6 @@ description:
   This package contains benchmarks that test cabal's dependency solver by running the cabal executable.
 
 category:           Distribution
-cabal-version:      2.2
 build-type:         Simple
 extra-source-files: README.md
 

solver-benchmarks/solver-benchmarks.cabal

+cabal-version:  2.2
 name:          solver-benchmarks
 version:       3
 copyright:     2003-2022, Cabal Development Team (see AUTHORS file)
@@ -11,7 +12,6 @@ synopsis:      Benchmarks for the cabal dependency solver
 description:
   This package contains benchmarks that test cabal's dependency solver by running the cabal executable.
 category:       Distribution
-cabal-version:  2.2
 build-type:     Simple
 
 extra-source-files: