Bump DeterminateSystems/magic-nix-cache-action from 3 to 4 (#3085)

Bumps
[DeterminateSystems/magic-nix-cache-action](https://github.com/determinatesystems/magic-nix-cache-action)
from 3 to 4.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/determinatesystems/magic-nix-cache-action/releases">DeterminateSystems/magic-nix-cache-action's
releases</a>.</em></p>
<blockquote>
<h2>v4</h2>
<h2>What's Changed</h2>
<ul>
<li>Correct privacy policy link by <a
href="https://github.com/grahamc"><code>@​grahamc</code></a> in <a
href="https://redirect.github.com/DeterminateSystems/magic-nix-cache-action/pull/33">DeterminateSystems/magic-nix-cache-action#33</a></li>
<li>Stop setting the default source branch to 'main' by <a
href="https://github.com/grahamc"><code>@​grahamc</code></a> in <a
href="https://redirect.github.com/DeterminateSystems/magic-nix-cache-action/pull/36">DeterminateSystems/magic-nix-cache-action#36</a></li>
<li>Introduce FlakeHub Cache by <a
href="https://github.com/grahamc"><code>@​grahamc</code></a> in <a
href="https://redirect.github.com/DeterminateSystems/magic-nix-cache-action/pull/35">DeterminateSystems/magic-nix-cache-action#35</a></li>
<li>Update readme for flakehub cache by <a
href="https://github.com/grahamc"><code>@​grahamc</code></a> in <a
href="https://redirect.github.com/DeterminateSystems/magic-nix-cache-action/pull/38">DeterminateSystems/magic-nix-cache-action#38</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/DeterminateSystems/magic-nix-cache-action/compare/v3...v4">https://github.com/DeterminateSystems/magic-nix-cache-action/compare/v3...v4</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/fc6aaceb40b9845a02b91e059ec147e78d1b4e41"><code>fc6aace</code></a>
Merge pull request <a
href="https://redirect.github.com/determinatesystems/magic-nix-cache-action/issues/38">#38</a>
from DeterminateSystems/flakehub-cache-readme</li>
<li><a
href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/f7df6894cf981e094cc90ae2e2c1ce2cb442f512"><code>f7df689</code></a>
Don't publish to ids</li>
<li><a
href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/b505f491cfe78683f3f043778dfefa6825c33fa5"><code>b505f49</code></a>
Update readme for flakehub cache</li>
<li><a
href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/122e91d3464f7a0985c87c9639b08aa5d9160b31"><code>122e91d</code></a>
Merge pull request <a
href="https://redirect.github.com/determinatesystems/magic-nix-cache-action/issues/35">#35</a>
from DeterminateSystems/flakehub-cache</li>
<li><a
href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/2c553b21e6f6d0fdf2d886db4950e41c07b4fa58"><code>2c553b2</code></a>
Add shellcheck checks to CI</li>
<li><a
href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/455b9185656000156842a00cce28404ed9d4a962"><code>455b918</code></a>
Use -closure ids</li>
<li><a
href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/1b7becab50d38fe7f5961bb379c1d68c1ef108bc"><code>1b7beca</code></a>
Merge remote-tracking branch 'origin/main' into flakehub-cache</li>
<li><a
href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/54acdd10fd23a8dff501938381c2303407ef71ff"><code>54acdd1</code></a>
Merge pull request <a
href="https://redirect.github.com/determinatesystems/magic-nix-cache-action/issues/36">#36</a>
from DeterminateSystems/grahamc-patch-1</li>
<li><a
href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/79f590d9a26e96e588b13a36c8cd549cdc5b5ddb"><code>79f590d</code></a>
/latest/ -&gt; /stable/</li>
<li><a
href="https://github.com/DeterminateSystems/magic-nix-cache-action/commit/14fda4e07607666fbdadd43a584ee4bc68398082"><code>14fda4e</code></a>
Stop setting the default source branch to 'main'</li>
<li>Additional commits viewable in <a
href="https://github.com/determinatesystems/magic-nix-cache-action/compare/v3...v4">compare
view</a></li>
</ul>
</details>
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.github/workflows/dev_envs.yml

@@ -17,7 +17,7 @@ jobs:
     - name: Install Nix
       uses: DeterminateSystems/nix-installer-action@v10
     - name: Run the Magic Nix Cache
-      uses: DeterminateSystems/magic-nix-cache-action@v3
+      uses: DeterminateSystems/magic-nix-cache-action@v4
 
     - run: nix run .# -- --version