Adds a deprection warning for python <= 3.9 (#787)

* Adds a deprection warning for python <= 3.9

Python 3.9 is EOL in 10/2025.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: jamaalscarlett

.gitignore

@@ -24,3 +24,5 @@ coverage.xml
 
 # vscode files
 .vscode/*
+
+dist/

push_notifications/__init__.py

@@ -1,8 +1,19 @@
+import sys
+import warnings
+
 try:
     # Python 3.8+
     import importlib.metadata as importlib_metadata
 except ImportError:
     # <Python 3.7 and lower
     import importlib_metadata
 
+if sys.version_info < (3, 10):
+    warnings.warn(
+        "Python 3.9 and earlier support is deprecated and will be removed in a future version. "
+        "Please upgrade to Python 3.10 or later.",
+        UserWarning,
+        stacklevel=2
+    )
+
 __version__ = importlib_metadata.version("django-push-notifications")