Disable Javascript tests in Scrutinizer

While at it, I simplified the environment variables, pinning node on a
less specific v20 version.

Author: MKodde

.scrutinizer.yml

@@ -2,15 +2,15 @@ build:
     # Use Ubuntu 22.04.5 LTS (Jammy Jellyfish)
     image: default-jammy
     environment:
-        php:
-            version: 8.2
-        node: "v20.18.3"
+        php: 8.2
+        node: v20
 
 filter:
     excluded_paths:
         - "*/Tests/*"
 
 checks:
+    javascript: false
     php:
         verify_property_names: true
         verify_argument_usable_as_reference: true