build(deps): bump cachix/install-nix-action from 31.6.2 to 31.7.0 (#8904)

Bumps
[cachix/install-nix-action](https://github.com/cachix/install-nix-action)
from 31.6.2 to 31.7.0.
<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>v31.7.0</h2>
<h2>What's Changed</h2>
<ul>
<li>
<p>feat: set up the environment based on the installer shell scripts by
<a href="https://github.com/sandydoo"><code>@​sandydoo</code></a> in <a
href="https://redirect.github.com/cachix/install-nix-action/pull/251">cachix/install-nix-action#251</a></p>
<p>Configures the following environment variables:</p>
<ul>
<li><code>NIX_PROFILES</code></li>
<li><code>NIX_SSL_CERT_FILE</code> (if not set)</li>
</ul>
<p>Adds the bin directory from the user's profile to
<code>$PATH</code>.</p>
</li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/cachix/install-nix-action/compare/v31.6.2...v31.7.0">https://github.com/cachix/install-nix-action/compare/v31.6.2...v31.7.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/cachix/install-nix-action/commit/9280e7aca88deada44c930f1e2c78e21c3ae3edd"><code>9280e7a</code></a>
fix: use -e to check for certs</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/effa594a17fc9b99b2ab4a94ebb246b976327414"><code>effa594</code></a>
fix: simplify setting the user profile</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/eb0f6c7357f23dc03126e4986b2329b13f86d1cf"><code>eb0f6c7</code></a>
ci: document where to find available images to test against</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/6676c23a719464ea6737a19b762b349adfb6b96c"><code>6676c23</code></a>
ci: add ubuntu-22.04-arm</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/cbf4b16d119d83a5889c36ca7a3cc3b48db30e9a"><code>cbf4b16</code></a>
Merge pull request <a
href="https://redirect.github.com/cachix/install-nix-action/issues/251">#251</a>
from cachix/fix-env</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/29a4dac2fa2041667aa7a202fdce30a92a77376e"><code>29a4dac</code></a>
tests: refactor tests to run under a single matrix</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/7449e8905b0560e816fd9eb0bfc53b6d0d73bc73"><code>7449e89</code></a>
tests: improve env tests and move to tests dir</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/d487f94a7aabbac81bdda3a3209fc9b018a80e6c"><code>d487f94</code></a>
lint</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/581a1341225b995dc4f3ee8b15657b1cd31a1146"><code>581a134</code></a>
refactor: document ssl-cert-file vs NIX_SSL_CERT_FILE</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/d914f6d9e8f0954b55d937bfcf393d65f212f331"><code>d914f6d</code></a>
refactor: drop ssl handling for unsupported platforms</li>
<li>Additional commits viewable in <a
href="https://github.com/cachix/install-nix-action/compare/a809471b5c7c913aa67bec8f459a11a0decc3fce...9280e7aca88deada44c930f1e2c78e21c3ae3edd">compare
view</a></li>
</ul>
</details>
<br />


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