Fix type assertion for channel name #109

Job	Run time
check-and-lint	19s
adapter-tests (24.x, windows-latest)	5m 17s
adapter-tests (24.x, ubuntu-latest)	51s
adapter-tests (22.x, windows-latest)	5m 52s
adapter-tests (24.x, macos-latest)	1m 2s
adapter-tests (22.x, macos-latest)	57s
adapter-tests (22.x, ubuntu-latest)	52s
deploy	-1s
	15m 9s

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