Allows AsyncSubstrateInterface's Websocket connection to not automatically shut down #43

Job	Run time
pull-docker-image	1m 17s
find-tests	5s
FB: tests/e2e_tests/test_old_new.py / Python 3.10	2m 45s
FB: tests/e2e_tests/test_substrate_addons.py / Python 3.9	1m 57s
FB: tests/e2e_tests/test_old_new.py / Python 3.11	1m 56s
FB: tests/e2e_tests/test_substrate_addons.py / Python 3.12	1m 31s
FB: tests/e2e_tests/test_substrate_addons.py / Python 3.13	1m 22s
FB: tests/e2e_tests/test_old_new.py / Python 3.12	2m 20s
FB: tests/e2e_tests/test_old_new.py / Python 3.13	2m 31s
FB: tests/e2e_tests/test_substrate_addons.py / Python 3.10	1m 54s
FB: tests/e2e_tests/test_old_new.py / Python 3.9	2m 0s
FB: tests/e2e_tests/test_substrate_addons.py / Python 3.11	1m 21s
	20m 59s

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