Samples that depend on BigQuery are not compatible with Python 3.10

[leahecole]

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.

periodic build log

******************** TESTING PROJECTS ********************
------------------------------------------------------------
- testing samples/snippets
------------------------------------------------------------
No user noxfile_config found: detail: No module named 'noxfile_config'
nox > Running session py-3.10
nox > Creating virtual environment (virtualenv) using python3.10 in .nox/py-3-10
nox > python -m pip install -r requirements.txt
nox > python -m pip install -r requirements-test.txt
nox > Command python -m pip install -r requirements-test.txt failed with exit code 1:
Collecting pytest==6.2.5
  Downloading pytest-6.2.5-py3-none-any.whl (280 kB)
ERROR: Could not find a version that satisfies the requirement google-cloud-bigquery==2.28.0 (from versions: 0.20.0, 0.21.0, 0.22.0, 0.22.1, 0.23.0, 0.24.0, 0.25.0, 0.26.0, 0.27.0, 0.28.0, 0.29.0, 0.30.0, 0.31.0, 0.32.0, 1.0.0, 1.1.0, 1.2.0, 1.3.0, 1.4.0, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.6.1, 1.6.2, 1.7.0, 1.7.2, 1.8.0, 1.8.1, 1.8.2, 1.9.0, 1.9.1, 1.10.0, 1.10.1, 1.11.1, 1.11.2, 1.11.3, 1.11.4, 1.12.0, 1.12.1, 1.12.2, 1.13.0, 1.13.1, 1.14.0, 1.14.1, 1.15.0, 1.15.1, 1.16.0, 1.16.1, 1.17.0, 1.17.1, 1.18.0, 1.18.1, 1.19.0, 1.19.1, 1.20.0, 1.21.0, 1.22.0, 1.23.0, 1.23.1, 1.24.0, 1.25.0, 1.26.0, 1.26.1, 1.27.2, 1.28.0, 2.0.0, 2.1.0, 2.2.0, 2.3.1, 2.4.0, 2.5.0, 2.6.0, 2.6.1)
ERROR: No matching distribution found for google-cloud-bigquery==2.28.0
nox > Session py-3.10 failed.

[leahecole]

Builds are passing!