Update tests and add news

Author: sergey-miryanov

Lib/test/test_interpreters/test_api.py

@@ -432,7 +432,8 @@ def test_cleanup_in_repl(self):
         exit()"""
         stdout, stderr = repl.communicate(script)
         self.assertIsNone(stderr)
-        self.assertIn(b"remaining subinterpreters", stdout)
+        msg = b"remaining subinterpreters; close them with Interpreter.close()"
+        self.assertIn(msg, stdout)
         self.assertNotIn(b"Traceback", stdout)
 
     @support.requires_subprocess()

Misc/NEWS.d/next/Core_and_Builtins/2025-11-14-00-19-45.gh-issue-141528.VWdax1.rst

@@ -0,0 +1,4 @@
+Fix warning message about remaining :mod:`subinterpreters
+<concurrent.interpreters>` while finalizing :mod:`"main" interpreter
+<concurrent.interpreters>` and suggest using of :method:`Interpreter.close`.
+Patch by Sergey Miryanov.