Fix pointers to Geometry schema

schema/ContextSourceRegistration.json

@@ -80,7 +80,7 @@
       }
     },
     "location": {
-      "$ref": "http://json-schema.org/geojson/geometry.json#"
+      "$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/geometry-schema.json#"
     },
     "expires": {
       "type": "string",

schema/Entity.json

@@ -103,7 +103,7 @@
           "const": "GeoProperty"
         },
         "value": {
-          "$ref": "http://json-schema.org/geojson/geometry.json#"
+          "$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/geometry-schema.json#"
         },
         "observedAt": {
           "$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/common.json#/definitions/observedAt"