Update version to include row_from_mapping changes released with 0.27.0

[MushuEE]

googleapis/google-cloud-python#3874

I had made a change to use this attr but did not realize how were were pinning versions at the time because I tested locally and not in container env

Traceback (most recent call last):
  File "stream.py", line 300, in <module>
    stop=StopWhen(OPTIONS.stop_at))
  File "stream.py", line 202, in main
    emitted = insert_data(table, make_json.make_rows(db, builds))
  File "stream.py", line 123, in insert_data
    row = table.row_from_mapping(row)
AttributeError: 'Table' object has no attribute ‘row_from_mapping'

[spiffxp]

/approve
/lgtm

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