gh-120057: add os.reload_environ to __all__ (#140763)

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

Lib/os.py

@@ -832,6 +832,7 @@ if _exists("_create_environ"):
         env_data.clear()
         env_data.update(data)
 
+    __all__.append("reload_environ")
 
 def getenv(key, default=None):
     """Get an environment variable, return None if it doesn't exist.

Misc/NEWS.d/next/Library/2025-10-29-16-12-41.gh-issue-120057.qGj5Dl.rst

@@ -0,0 +1 @@
+Add :func:`os.reload_environ` to ``os.__all__``.