bump llvm 19=>20

Author: mazunki

overlay.nix

@@ -6,7 +6,7 @@
 final: prev: {
 
   stdenvIncludeOS = prev.pkgsStatic.lib.makeScope prev.pkgsStatic.newScope (self: {
-    llvmPkgs = prev.pkgsStatic.llvmPackages_19;
+    llvmPkgs = prev.pkgsStatic.llvmPackages_20;
     stdenv = self.llvmPkgs.libcxxStdenv; # Use this as base stdenv
 
     # Import unpatched musl for building libcxx. Libcxx needs some linux headers to be passed through.

unittests.nix

@@ -1,6 +1,6 @@
 { nixpkgs ? ./pinned.nix,
   pkgs ? import nixpkgs { config = { }; overlays = [ ]; },
-  stdenv ? pkgs.llvmPackages_19.libcxxStdenv,
+  stdenv ? pkgs.llvmPackages_20.libcxxStdenv,
   withCcache ? false,
 }:
 stdenv.mkDerivation rec {