criterion: remove "v" prefix from version of test derivation

The version string must start with a digit per nixpkgs versioning guideline.

pkgs/by-name/cr/criterion/tests/001-version.nix

···
 }:
 stdenv.mkDerivation rec {
   name = "version-tester";
-  version = "v${criterion.version}";
+  inherit (criterion) version;
   src = ./test_dummy.c;
 
   dontUnpack = true;