Fix incorrect TypingUnionType import check

RELEASE.md

@@ -0,0 +1,5 @@
+Release type: patch
+
+TypingUnionType import error check is reraised because TypingGenericAlias is checked at the same time which is checked under 3.9 instead of under 3.10
+
+Fix by separating TypingUnionType and TypingGenericAlias imports in their own try-catch

noxfile.py

@@ -104,7 +104,7 @@ def tests_integrations(session: Session, integration: str) -> None:
     session.run("pytest", *COMMON_PYTEST_OPTIONS, "-m", integration)
 
 
-@session(python=["3.11"], name="Pydantic tests", tags=["tests"])
+@session(python=PYTHON_VERSIONS, name="Pydantic tests", tags=["tests"])
 @nox.parametrize("pydantic", ["1.10", "2.0.3"])
 def test_pydantic(session: Session, pydantic: str) -> None:
     session.run_always("poetry", "install", external=True)

strawberry/experimental/pydantic/fields.py

@@ -22,6 +22,15 @@
 
 try:
     from types import UnionType as TypingUnionType
+except ImportError:
+    import sys
+
+    if sys.version_info < (3, 10):
+        TypingUnionType = ()
+    else:
+        raise
+
+try:
     from typing import GenericAlias as TypingGenericAlias  # type: ignore
 except ImportError:
     import sys
@@ -32,10 +41,6 @@
         TypingGenericAlias = ()
     else:
         raise
-    if sys.version_info < (3, 10):
-        TypingUnionType = ()
-    else:
-        raise
 
 ATTR_TO_TYPE_MAP = {
     "NoneStr": Optional[str],