fix(go/adbc/driver/snowflake): call GetObjects with null catalog at c… #431

Job	Run time
check (macOS, adbcdrivermanager) / r-check	2m 3s
check (macOS, adbcflightsql) / r-check	2m 24s
check (macOS, adbcpostgresql) / r-check	2m 23s
check (macOS, adbcsnowflake) / r-check	2m 9s
check (macOS, adbcsqlite) / r-check	2m 5s
check (ubuntu, adbcdrivermanager) / r-check	1m 53s
check (ubuntu, adbcflightsql) / r-check	3m 24s
check (ubuntu, adbcpostgresql) / r-check	2m 23s
check (ubuntu, adbcsnowflake) / r-check	3m 8s
check (ubuntu, adbcsqlite) / r-check	2m 1s
check (windows, adbcdrivermanager) / r-check	3m 18s
check (windows, adbcflightsql) / r-check	4m 52s
check (windows, adbcpostgresql) / r-check	4m 47s
check (windows, adbcsnowflake) / r-check	7m 1s
check (windows, adbcsqlite) / r-check	3m 41s
	47m 32s

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