fix config schema

Author: tomkralidis

pygeoapi/resources/schemas/config/pygeoapi-config-0.x.yml

@@ -451,7 +451,7 @@ properties:
                                               description: temporal reference system of features
                                               default: 'http://www.opengis.net/def/uom/ISO-8601/0/Gregorian'
                               patternProperties:
-                                  "^.*$":
+                                  "^(?!spatial$|temporal$).*":
                                       type: object
                                       description: additional custom dimensions
                                       properties: