chore: upgrade runtime to Bun 1.4.0

- Update Nix flake.nix overlay to use Bun 1.4.0 (overrideAttrs)
- Update CI (setup-bun) to pin bun-version: 1.4.0
- Update package.json packageManager/Dockerfile/vercel.json
- sha256: sha256:Poy0vf7yJ/hzk33QiQj5gnshI5Q7dfbaMD7xgwiyDKw=

flake.nix

@@ -9,7 +9,20 @@
   outputs = { self, nixpkgs, flake-utils }:
     flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:
       let
-        pkgs = import nixpkgs { inherit system; };
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [
+            (self: super: {
+              bun = super.bun.overrideAttrs (old: rec {
+                version = "1.4.0";
+                src = super.fetchzip {
+                  url = "https://github.com/oven-sh/bun/releases/download/bun-v1.4.0/bun-linux-x64.zip";
+                  sha256 = "sha256:Poy0vf7yJ/hzk33QiQj5gnshI5Q7dfbaMD7xgwiyDKw=";
+                };
+              });
+            })
+          ];
+        };
 
         # TeleUploader package
         teleuploader = pkgs.stdenvNoCC.mkDerivation rec {