Fix manifest.toml schema : add antifeatures section

schemas/manifest.v2.schema.json

@@ -142,6 +142,14 @@
                 }
             }
         },
+        "antifeatures": {
+            "type": "object",
+            "required": [],
+            "additionalProperties": false,
+            "patternProperties": {
+                "^[a-zA-Z0-9_-]*$": {"$ref": "#/$defs/translated_string"}
+            }
+        },
         "install": {
             "type": "object",
             "required": [],