Update _data/validator-libraries-modern.yml

Co-authored-by: Jason Desrosiers <[email protected]>

Author: gregsdennis

_data/validator-libraries-modern.yml

@@ -285,8 +285,7 @@
       notes: Powered by JsonSchema.Net; server-side validation
     - name: jsonschema.dev
       url: https://jsonschema.dev
-      date-draft: [2019-09]
-      draft: [7, 6, 4]
+      draft: [7]
       notes: Powered by ajv; client-side validation
     - name: jschon.dev
       url: https://jschon.dev/