fix: temporary catch2_3 override until upstreamed to nixpkgs

nix/default.nix

@@ -1,9 +1,20 @@
 { lib
+, pkgs
 , waybar
 , version
 }:
-
-waybar.overrideAttrs (prev: {
+let
+  catch2_3 = {
+    src = pkgs.fetchFromGitHub
+      {
+        owner = "catchorg";
+        repo = "Catch2";
+        rev = "v3.5.1";
+        hash = "sha256-OyYNUfnu6h1+MfCF8O+awQ4Usad0qrdCtdZhYgOY+Vw=";
+      };
+  };
+in
+(waybar.overrideAttrs (oldAttrs: rec {
   inherit version;
 
   src = lib.cleanSourceWith {
@@ -11,3 +22,9 @@ waybar.overrideAttrs (prev: {
     src = lib.cleanSource ../.;
   };
 })
+).override {
+  catch2_3 = pkgs.catch2_3.overrideAttrs (oldAttrs: {
+    version = "3.5.1";
+    src = catch2_3.src;
+  });
+}