Go back to 18.x for now

Author: hoxbro

.github/workflows/ipywidgets-bokeh-ci.yml

@@ -15,7 +15,7 @@ jobs:
       max-parallel: 3
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        node-version: [20.x]
+        node-version: [18.x]
         python-version: ["3.12"]
 
     defaults: