Limit importlib-metadata backwport to < 5.0.0 (#29924)

The Importlib-metadata 5 breaks importing Celery < 5.3.0. Until
Celery 5.3.0 gets released (it is pre-release/beta now) we should
workaround the problem by limiting importlib-metadata to < 5.0.0.

(cherry picked from commit 4ea457a)

setup.cfg

@@ -99,7 +99,10 @@ install_requires =
     graphviz>=0.12
     gunicorn>=20.1.0
     httpx
-    importlib_metadata>=1.7;python_version<"3.9"
+    # Importlib-metadata 5 is breaking Celery import due to regression it introduced
+    # This was tracked and fixed in https://github.com/celery/celery/pull/7785 but it is not released yet
+    # We can remove the < 5.0.0 limitation hwne Celery 5.3.0 gets released and we bump celeryt o >= 5.3.0
+    importlib_metadata>=1.7,<5.0.0;python_version<"3.9"
     importlib_resources>=5.2;python_version<"3.9"
     itsdangerous>=2.0
     jinja2>=3.0.0