change tests to run on python 3.9 #3300

Job	Run time
test (latest_official, athena) / test	30s
test (1.3.0, postgres) / test	27s
test (latest_official, bigquery) / test	30s
test (latest_official, databricks_catalog) / test	32s
test (latest_official, databricks) / test	31s
test (latest_official, postgres) / test	27s
test (latest_official, redshift) / test	21s
test (latest_official, snowflake) / test	21s
test (latest_official, trino) / test	30s
test (latest_pre, postgres) / test	19s
Notify Slack	0s
	4m 28s

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