build(deps): bump cachix/install-nix-action from 24 to 26 (#88)

Bumps
[cachix/install-nix-action](https://github.com/cachix/install-nix-action)
from 24 to 26.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/cachix/install-nix-action/releases">cachix/install-nix-action's
releases</a>.</em></p>
<blockquote>
<h2>v26</h2>
<p>Bump to Nix 2.20.5 to address CVE-2024-27297 /
GHSA-2ffj-w4mj-pg37.</p>
<h2>install-nix-action-v25</h2>
<p>Nix 2.19.2</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/cachix/install-nix-action/commit/8887e596b4ee1134dae06b98d573bd674693f47c"><code>8887e59</code></a>
Nix: 2.20.5</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/39a075cc21e415568870fbcfee53551b3764501d"><code>39a075c</code></a>
bump</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/6004951b182f8860210c8d6f0d808ec5b1a33d28"><code>6004951</code></a>
Nix: 2.19.1 -&gt; 2.19.2</li>
<li>See full diff in <a
href="https://github.com/cachix/install-nix-action/compare/v24...v26">compare
view</a></li>
</ul>
</details>
<br />


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</details>

.github/workflows/test.yml

@@ -31,7 +31,7 @@ jobs:
         fetch-depth: 0
 
     # Install Nix and use that to run our tests so our environment matches exactly.
-    - uses: cachix/install-nix-action@v24
+    - uses: cachix/install-nix-action@v26
       with:
         nix_path: nixpkgs=channel:nixos-unstable
 
@@ -56,7 +56,7 @@ jobs:
         fetch-depth: 0
 
     # Install Nix and use that to run our tests so our environment matches exactly.
-    - uses: cachix/install-nix-action@v24
+    - uses: cachix/install-nix-action@v26
       with:
         nix_path: nixpkgs=channel:nixos-unstable