gh-142784: make the asyncio REPL call loop.close() at exit (#142785)

Author: johnslavik

Lib/asyncio/__main__.py

@@ -240,4 +240,5 @@ def interrupt(self) -> None:
             break
 
     console.write('exiting asyncio REPL...\n')
+    loop.close()
     sys.exit(return_code)

Misc/NEWS.d/next/Library/2025-12-16-04-39-27.gh-issue-142784.HBGJag.rst

@@ -0,0 +1,3 @@
+The :mod:`asyncio` REPL now properly closes the loop upon the end of interactive session.
+Previously, it could cause surprising warnings.
+Contributed by Bartosz Sławecki.