Bumps [actions/cache](https://github.com/actions/cache) from v2.1.4 to v2.1.5.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/actions/cache/releases">actions/cache's releases</a>.</em></p>
<blockquote>
<h2>v2.1.5</h2>
<ul>
<li>Fix permissions error seen when extracting caches with GNU tar that were previously created using BSD tar (<a href="https://github-redirect.dependabot.com/actions/cache/issues/527">actions/cache#527</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="1a9e2138d9"><code>1a9e213</code></a> Update cache module to v1.0.7 (<a href="https://github-redirect.dependabot.com/actions/cache/issues/562">#562</a>)</li>
<li><a href="981fa981ed"><code>981fa98</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/actions/cache/issues/469">#469</a> from ericmj/patch-1</li>
<li><a href="4498c5b4d8"><code>4498c5b</code></a> Drop the example based on using pip's internals (<a href="https://github-redirect.dependabot.com/actions/cache/issues/519">#519</a>)</li>
<li><a href="4134e6de47"><code>4134e6d</code></a> It is not recommended to cache node_modules (<a href="https://github-redirect.dependabot.com/actions/cache/issues/537">#537</a>)</li>
<li><a href="62a4d75442"><code>62a4d75</code></a> Also cache _build for Elixir</li>
<li>See full diff in <a href="https://github.com/actions/cache/compare/v2.1.4...1a9e2138d905efd099035b49d8b7a3888c653ca8">compare view</a></li>
</ul>
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* Simplify syntax & lint. Combine apt installations into a single step. Future-proof OS selections.
* Remove caching
* Run clippy within the linux stable build. Parallelize all the builds. Cargo check is unneeded.
* build and run tests on windows and macos
