Bumps [magnetikonline/action-golang-cache](https://github.com/magnetikonline/action-golang-cache) from 3 to 4.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/magnetikonline/action-golang-cache/releases">magnetikonline/action-golang-cache's releases</a>.</em></p>
<blockquote>
<h2>v4</h2>
<ul>
<li>Provide action outputs of <code>build-cache-path</code>, <code>module-cache-path</code> and <code>cache-key</code>.</li>
<li>Some <code>README.md</code> cleanups.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="8f4eaf544f"><code>8f4eaf5</code></a> Updated action version and usage examples to include <code>outputs:</code></li>
<li><a href="3388f2a59a"><code>3388f2a</code></a> Provide outputs for Golang build/module paths and generated cache key</li>
<li><a href="ef3757439c"><code>ef37574</code></a> Refine action input descriptions</li>
<li><a href="ba4f7b3e0d"><code>ba4f7b3</code></a> Remove leading dash from <code>cache-key-suffix:</code> usage example in <code>README.md</code> - n...</li>
<li><a href="189ebca495"><code>189ebca</code></a> Bump Golang version in <code>README.md</code> examples</li>
<li>See full diff in <a href="https://github.com/magnetikonline/action-golang-cache/compare/v3...v4">compare view</a></li>
</ul>
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