chore(deps): bump certifi from 2022.9.24 to 2022.12.7 in /.kokoro (#2207)

Bumps [certifi](https://togithub.com/certifi/python-certifi) from 2022.9.24 to 2022.12.7.
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<summary>Commits</summary>
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<li><a href="https://togithub.com/certifi/python-certifi/commit/9e9e840925d7b8e76c76fdac1fab7e6e88c1c3b8"><code>9e9e840</code></a> 2022.12.07</li>
<li>See full diff in <a href="https://togithub.com/certifi/python-certifi/compare/2022.09.24...2022.12.07">compare view</a></li>
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Author: dependabot[bot]