nix: default to jdk25 in devShell sbt

Author: neko-kai

flake.nix

@@ -22,14 +22,15 @@
           inherit system;
           config.allowUnfree = true;
         };
+        defaultJdk = pkgs.jdk25_headless;
       in
       {
         devShells.default = pkgs.mkShell {
           nativeBuildInputs = with pkgs.buildPackages; [
             ncurses
 
             coursier
-            sbt
+            (sbt.override { jre = defaultJdk; })
 
             nodejs
             nodePackages.npm