treewide: clean up 'meta = with' pattern

This commit was created by a combination of scripts and tools:
- an ast-grep script to prefix things in meta with `lib.`,
- a modified nixf-diagnose / nixf combination to remove unused `with
lib;`, and
- regular nixfmt.

Co-authored-by: Wolfgang Walther <walther@technowledgy.de>

pkgs/development/compilers/dotnet/build-dotnet.nix

@@ -217,11 +217,11 @@ mkWrapper type (
       }
     );
 
-    meta = with lib; {
+    meta = {
       description = builtins.getAttr type descriptions;
       homepage = "https://dotnet.github.io/";
-      license = licenses.mit;
-      maintainers = with maintainers; [
+      license = lib.licenses.mit;
+      maintainers = with lib.maintainers; [
         kuznero
         mdarocha
         corngood

pkgs/development/compilers/dotnet/vmr.nix

@@ -500,11 +500,11 @@ stdenv.mkDerivation rec {
     hasILCompiler = lib.versionAtLeast version "9";
   };
 
-  meta = with lib; {
+  meta = {
     description = "Core functionality needed to create .NET Core projects, that is shared between Visual Studio and CLI";
     homepage = "https://dotnet.github.io/";
-    license = licenses.mit;
-    maintainers = with maintainers; [ corngood ];
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ corngood ];
     mainProgram = "dotnet";
     platforms = [
       "x86_64-linux"