Samples that depend on BigQuery are not yet compatible with Python 3.10

[busunkim96]

google-cloud-bigquery does not yet support Python 3.10. When it does, the 3.10 samples check should turn green. For now, it is OK to merge PRs with a failing 3.10 samples check (the status check is intentionally optional).

See googleapis/python-bigquery#1006 for the status of python 3.10 support.

[leahecole]

hoping #284 will fix this