update wording in exception message (python abstract) (OpenAPITools#1…

…7437)

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractPythonCodegen.java

@@ -1088,7 +1088,7 @@ public void setMapNumberTo(String mapNumberTo) {
                 || "float".equals(mapNumberTo)) {
             this.mapNumberTo = mapNumberTo;
         } else {
-            throw new IllegalArgumentException("mapNumberTo value must be Union[StrictFloat, StrictInt], StrictStr or float");
+            throw new IllegalArgumentException("mapNumberTo value must be Union[StrictFloat, StrictInt], StrictFloat or float");
         }
     }