source-airtable: re-add removed `auth_method` property #54

Job	Run time
py_connector (source-airtable, capture, v1, 1.0)	2m 10s
py_connector (source-asana, capture, v1, 1.0)	2m 47s
py_connector (source-facebook-marketing, capture, v4, 1.0)	2m 0s
py_connector (source-gladly, capture, v1, 1.0)	1m 54s
py_connector (source-google-ads, capture, v2, 1.0)	2m 15s
py_connector (source-google-sheets-native, capture, v1, 0.0)	2m 15s
py_connector (source-hubspot-native, capture, v1, 1.0)	1m 52s
py_connector (source-hubspot, capture, v5, 1.0)	2m 56s
	18m 9s

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