sillytavern: fix build by pinning nodejs to v22

pkgs/by-name/si/sillytavern/package.nix

@@ -1,6 +1,7 @@
 {
   buildNpmPackage,
   fetchFromGitHub,
+  nodejs_22,
   lib,
 }:
 buildNpmPackage (finalAttrs: {
@@ -17,6 +18,9 @@ buildNpmPackage (finalAttrs: {
 
   dontNpmBuild = true;
 
+  # https://github.com/NixOS/nixpkgs/issues/474535
+  nodejs = nodejs_22;
+
   # These dirs are not installed automatically.
   # And if they were not in place, the app would try to create them at runtime, which is of course impossible to achieve.
   postInstall = ''