Bump cachix/install-nix-action from 29 to 30 (#174)

Bumps
[cachix/install-nix-action](https://github.com/cachix/install-nix-action)
from 29 to 30.
<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>v30</h2>
<ul>
<li>Nix: 2.24.7 -&gt; 2.24.9, fixing <a
href="https://github.com/NixOS/nix/security/advisories/GHSA-6fjr-mq49-mm2c">GHSA-6fjr-mq49-mm2c</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/cachix/install-nix-action/commit/08dcb3a5e62fa31e2da3d490afc4176ef55ecd72"><code>08dcb3a</code></a>
Merge pull request <a
href="https://redirect.github.com/cachix/install-nix-action/issues/217">#217</a>
from Enzime/bump</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/4204e15198ce9348dda13b658f2b0b45397cf9e7"><code>4204e15</code></a>
nix: 2.24.8 -&gt; 2.24.9</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/6a10e2e9fdd7f91408e9f9f95bdc77cf5232b932"><code>6a10e2e</code></a>
Merge pull request <a
href="https://redirect.github.com/cachix/install-nix-action/issues/216">#216</a>
from Mic92/nix-bump</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/2bb614e91ac4d68577f12de9f9844d1e89c80b8d"><code>2bb614e</code></a>
Nix: 2.24.7 -&gt; 2.24.8</li>
<li>See full diff in <a
href="https://github.com/cachix/install-nix-action/compare/v29...v30">compare
view</a></li>
</ul>
</details>
<br />


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.github/workflows/cachix.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v29
+      - uses: cachix/install-nix-action@v30
         with:
           github_access_token: '${{ secrets.GITHUB_TOKEN }}'
       - name: Cachix

.github/workflows/update.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v29
+      - uses: cachix/install-nix-action@v30
         with:
           github_access_token: '${{ secrets.GITHUB_TOKEN }}'
       - name: Cachix