Updates the type hint on ws_shutdown_timer in RetryAsyncSubstrate #52

Job	Run time
pull-docker-image	28s
find-tests	4s
FB: tests/e2e_tests/test_substrate_addons.py / Python 3.9	1m 18s
FB: tests/e2e_tests/test_substrate_addons.py / Python 3.13	1m 30s
FB: tests/e2e_tests/test_old_new.py / Python 3.11	2m 57s
FB: tests/e2e_tests/test_old_new.py / Python 3.10	3m 32s
FB: tests/e2e_tests/test_old_new.py / Python 3.9	2m 59s
FB: tests/e2e_tests/test_substrate_addons.py / Python 3.12	1m 35s
FB: tests/e2e_tests/test_substrate_addons.py / Python 3.11	2m 6s
FB: tests/e2e_tests/test_substrate_addons.py / Python 3.10	1m 19s
FB: tests/e2e_tests/test_old_new.py / Python 3.12	2m 36s
FB: tests/e2e_tests/test_old_new.py / Python 3.13	2m 28s
	22m 52s

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