fix: replace | union syntax with Union for Python 3.9 compatibility

Replace runtime | operator with Union from typing to support Python 3.9-3.13:
- graphql/constants.py: VARIABLE_TYPE_MAPPING tuples
- diff.py: GraphQL query variables dict

The | operator for types only works at runtime in Python 3.10+.

Author: wvandeun

infrahub_sdk/diff.py

@@ -3,6 +3,7 @@
 from datetime import datetime
 from typing import (
     Any,
+    Union,
 )
 
 from typing_extensions import NotRequired, TypedDict
@@ -199,8 +200,8 @@ def get_diff_tree_query() -> Query:
         },
         variables={
             "branch_name": str,
-            "name": str | None,
-            "from_time": datetime | None,
-            "to_time": datetime | None,
+            "name": Union[str, None],
+            "from_time": Union[datetime, None],
+            "to_time": Union[datetime, None],
         },
     )

infrahub_sdk/graphql/constants.py

@@ -1,14 +1,15 @@
 from datetime import datetime
+from typing import Union
 
 VARIABLE_TYPE_MAPPING = (
     (str, "String!"),
-    (str | None, "String"),
+    (Union[str, None], "String"),
     (int, "Int!"),
-    (int | None, "Int"),
+    (Union[int, None], "Int"),
     (float, "Float!"),
-    (float | None, "Float"),
+    (Union[float, None], "Float"),
     (bool, "Boolean!"),
-    (bool | None, "Boolean"),
+    (Union[bool, None], "Boolean"),
     (datetime, "DateTime!"),
-    (datetime | None, "DateTime"),
+    (Union[datetime, None], "DateTime"),
 )