[3.12] gh-117691: Add an appropriate stacklevel for PEP-706 tarfile deprecation warnings (GH-117872) (GH-117930)

gh-117691: Add an appropriate stacklevel for PEP-706 tarfile deprecation warnings (GH-117872)
(cherry picked from commit cff0a2db00)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

Lib/tarfile.py

@@ -2222,7 +2222,7 @@ class TarFile(object):
                     'Python 3.14 will, by default, filter extracted tar '
                     + 'archives and reject files or modify their metadata. '
                     + 'Use the filter argument to control this behavior.',
-                    DeprecationWarning)
+                    DeprecationWarning, stacklevel=3)
                 return fully_trusted_filter
             if isinstance(filter, str):
                 raise TypeError(