build(gql_websocket_link): upgrade web_socket_channel to v3.0.1, rxdart to >=0.26.0 <= 0.28.0 #945

Job	Run time
publish_dry_run	19s
Check end_to_end_test	1m 2s
Check gql_example_cli	43s
Check end_to_end_test_tristate	56s
Check gql	36s
Check gql_example_cli_github	51s
Check gql_exec	31s
Check gql_example_build	48s
Check gql_code_builder_serializers	24s
Check gql_example_http_auth_link	25s
Check gql_build	30s
Check gql_example_dio_link	25s
Check gql_code_builder	47s
Check gql_link	28s
Check gql_dedupe_link	34s
Check gql_dio_link	55s
Check gql_error_link	32s
Check gql_http_link	50s
Check gql_websocket_link	1m 17s
Check gql_transform_link	32s
Check gql_tristate_value	32s
	13m 57s

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