build(deps): bump certifi from 2022.12.7 to 2023.7.22 in /.kokoro (#6114

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Bumps [certifi](https://togithub.com/certifi/python-certifi) from 2022.12.7 to 2023.7.22.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://togithub.com/certifi/python-certifi/commit/8fb96ed81f71e7097ed11bc4d9b19afd7ea5c909"><code>8fb96ed</code></a> 2023.07.22</li>
<li><a href="https://togithub.com/certifi/python-certifi/commit/afe77220e0eaa722593fc5d294213ff5275d1b40"><code>afe7722</code></a> Bump actions/setup-python from 4.6.1 to 4.7.0 (<a href="https://redirect.github.com/certifi/python-certifi/issues/230">#230</a>)</li>
<li><a href="https://togithub.com/certifi/python-certifi/commit/2038739ad56abec7aaddfa90ad2ce6b3ed7f5c7b"><code>2038739</code></a> Bump dessant/lock-threads from 3.0.0 to 4.0.1 (<a href="https://redirect.github.com/certifi/python-certifi/issues/229">#229</a>)</li>
<li><a href="https://togithub.com/certifi/python-certifi/commit/44df761f4c09d19f32b3cc09208a739043a5e25b"><code>44df761</code></a> Hash pin Actions and enable dependabot (<a href="https://redirect.github.com/certifi/python-certifi/issues/228">#228</a>)</li>
<li><a href="https://togithub.com/certifi/python-certifi/commit/8b3d7bae85bbc87c9181cc1d39548db3d31627f0"><code>8b3d7ba</code></a> 2023.05.07</li>
<li><a href="https://togithub.com/certifi/python-certifi/commit/53da2405b1af430f6bafa21ba45d8dd8dfc726b8"><code>53da240</code></a> ci: Add Python 3.12-dev to the testing (<a href="https://redirect.github.com/certifi/python-certifi/issues/224">#224</a>)</li>
<li><a href="https://togithub.com/certifi/python-certifi/commit/c2fc3b1f64d6946f1057971ee897ea828ae848d8"><code>c2fc3b1</code></a> Create a Security Policy (<a href="https://redirect.github.com/certifi/python-certifi/issues/222">#222</a>)</li>
<li><a href="https://togithub.com/certifi/python-certifi/commit/c211ef482a01aff5f1bc92c4128bfa0c955f4a01"><code>c211ef4</code></a> Set up permissions to github workflows (<a href="https://redirect.github.com/certifi/python-certifi/issues/218">#218</a>)</li>
<li><a href="https://togithub.com/certifi/python-certifi/commit/2087de5d0aa1d472145fc1dbdfece3fe652bbac5"><code>2087de5</code></a> Don't let deprecation warning fail CI (<a href="https://redirect.github.com/certifi/python-certifi/issues/219">#219</a>)</li>
<li><a href="https://togithub.com/certifi/python-certifi/commit/e0b9fc5c8f52ac8c300da502e5760ce3d41429ec"><code>e0b9fc5</code></a> remove paragraphs about 1024-bit roots from README</li>
<li>Additional commits viewable in <a href="https://togithub.com/certifi/python-certifi/compare/2022.12.07...2023.07.22">compare view</a></li>
</ul>
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[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=certifi&package-manager=pip&previous-version=2022.12.7&new-version=2023.7.22)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

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[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

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