build(deps): Bump github.com/prometheus/client_golang from 1.8.0 to 1.9.0 (#5807)
Bumps [github.com/prometheus/client_golang](https://github.com/prometheus/client_golang) from 1.8.0 to 1.9.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/prometheus/client_golang/releases">github.com/prometheus/client_golang's releases</a>.</em></p>
<blockquote>
<h2>1.9.0 / 2020-12-17</h2>
<ul>
<li>[FEATURE] <code>NewPidFileFn</code> helper to create process collectors for processes whose PID is read from a file. <a href="https://github-redirect.dependabot.com/prometheus/client_golang/issues/804">#804</a></li>
<li>[BUGFIX] promhttp: Prevent endless loop in <code>InstrumentHandler...</code> middlewares with invalid metric or label names. <a href="https://github-redirect.dependabot.com/prometheus/client_golang/issues/823">#823</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/prometheus/client_golang/blob/master/CHANGELOG.md">github.com/prometheus/client_golang's changelog</a>.</em></p>
<blockquote>
<h2>1.9.0 / 2020-12-17</h2>
<ul>
<li>[FEATURE] <code>NewPidFileFn</code> helper to create process collectors for processes whose PID is read from a file. <a href="https://github-redirect.dependabot.com/prometheus/client_golang/issues/804">#804</a></li>
<li>[BUGFIX] promhttp: Prevent endless loop in <code>InstrumentHandler...</code> middlewares with invalid metric or label names. <a href="https://github-redirect.dependabot.com/prometheus/client_golang/issues/823">#823</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="d89cf5af88"><code>d89cf5a</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/prometheus/client_golang/issues/826">#826</a> from prometheus/beorn7/release</li>
<li><a href="80ca9cdc4e"><code>80ca9cd</code></a> Cut release 1.9.0</li>
<li><a href="8d16199dea"><code>8d16199</code></a> Update dependencies</li>
<li><a href="8b73bd904c"><code>8b73bd9</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/prometheus/client_golang/issues/823">#823</a> from prometheus/beorn7/promhttp</li>
<li><a href="98eb6cbf7c"><code>98eb6cb</code></a> promhttp: Correctly detect invalid metric and label names</li>
<li><a href="37c26edd5b"><code>37c26ed</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/prometheus/client_golang/issues/821">#821</a> from prometheus/beorn7/multierror</li>
<li><a href="34ca120377"><code>34ca120</code></a> Be more explicit about the multi-line properties of MultiError</li>
<li><a href="fd6d368676"><code>fd6d368</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/prometheus/client_golang/issues/819">#819</a> from jubalh/sp</li>
<li><a href="cf6dc82780"><code>cf6dc82</code></a> Correct spelling: possibilites -> possibilities</li>
<li><a href="39b478e90c"><code>39b478e</code></a> Added example api code showing how to add auth tokens and user agents to prom...</li>
<li>Additional commits viewable in <a href="https://github.com/prometheus/client_golang/compare/v1.8.0...v1.9.0">compare view</a></li>
</ul>
</details>
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