gh-91880 - fix typo (GH-92069)

#91880 (comment) - With thanks to @MojoVampire for spotting this.

Automerge-Triggered-By: GH:gvanrossum

Author: davidhewitt

Lib/asyncio/runners.py

@@ -106,7 +106,7 @@ def run(self, coro, *, context=None):
                 # `signal.signal` may throw if `threading.main_thread` does
                 # not support signals (e.g. embedded interpreter with signals
                 # not registered - see gh-91880)
-                signal_handler = None
+                sigint_handler = None
         else:
             sigint_handler = None