chore: CI: bump namespacelabs/nscloud-checkout-action from 7 to 8 (#11457)

Bumps
[namespacelabs/nscloud-checkout-action](https://github.com/namespacelabs/nscloud-checkout-action)
from 7 to 8.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/namespacelabs/nscloud-checkout-action/releases">namespacelabs/nscloud-checkout-action's
releases</a>.</em></p>
<blockquote>
<h2>v8.0.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Rework checkout flow to precisely control what is fetched and
checked out. by <a
href="https://github.com/nichtverstehen"><code>@​nichtverstehen</code></a>
in <a
href="https://redirect.github.com/namespacelabs/nscloud-checkout-action/pull/22">namespacelabs/nscloud-checkout-action#22</a></li>
<li>Log all mirrored refs in debug mode. by <a
href="https://github.com/nichtverstehen"><code>@​nichtverstehen</code></a>
in <a
href="https://redirect.github.com/namespacelabs/nscloud-checkout-action/pull/23">namespacelabs/nscloud-checkout-action#23</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/namespacelabs/nscloud-checkout-action/compare/v7.1.0...v8.0.0">https://github.com/namespacelabs/nscloud-checkout-action/compare/v7.1.0...v8.0.0</a></p>
<h2>v7.1.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Correctly check out merge branches for PRs. by <a
href="https://github.com/nichtverstehen"><code>@​nichtverstehen</code></a>
in <a
href="https://redirect.github.com/namespacelabs/nscloud-checkout-action/pull/21">namespacelabs/nscloud-checkout-action#21</a></li>
<li>Set up remote.origin.fetch to allow fetching any branch. by <a
href="https://github.com/nichtverstehen"><code>@​nichtverstehen</code></a>
in <a
href="https://redirect.github.com/namespacelabs/nscloud-checkout-action/pull/21">namespacelabs/nscloud-checkout-action#21</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a
href="https://github.com/nichtverstehen"><code>@​nichtverstehen</code></a>
made their first contribution in <a
href="https://redirect.github.com/namespacelabs/nscloud-checkout-action/pull/21">namespacelabs/nscloud-checkout-action#21</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/namespacelabs/nscloud-checkout-action/compare/v7...v7.1.0">https://github.com/namespacelabs/nscloud-checkout-action/compare/v7...v7.1.0</a></p>
<h2>V7.0.1</h2>
<p>No release notes provided.</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="0c5e6ce59a"><code>0c5e6ce</code></a>
Merge pull request <a
href="https://redirect.github.com/namespacelabs/nscloud-checkout-action/issues/25">#25</a>
from namespacelabs/fix-doing-lfs-checkouts-on-macos</li>
<li><a
href="135cb5f92a"><code>135cb5f</code></a>
Fix doing lfs checkouts on macos</li>
<li><a
href="2716e107fb"><code>2716e10</code></a>
Merge pull request <a
href="https://redirect.github.com/namespacelabs/nscloud-checkout-action/issues/24">#24</a>
from namespacelabs/kirill/prune</li>
<li><a
href="700dc55af6"><code>700dc55</code></a>
Prune references in the mirror when fetching.</li>
<li><a
href="28e5665c3c"><code>28e5665</code></a>
Merge pull request <a
href="https://redirect.github.com/namespacelabs/nscloud-checkout-action/issues/23">#23</a>
from namespacelabs/kirill/all</li>
<li><a
href="e03456f7c8"><code>e03456f</code></a>
Log all mirrored refs in debug mode.</li>
<li><a
href="253d47cfc0"><code>253d47c</code></a>
Merge pull request <a
href="https://redirect.github.com/namespacelabs/nscloud-checkout-action/issues/22">#22</a>
from namespacelabs/kirill/init</li>
<li><a
href="f2df08a5f7"><code>f2df08a</code></a>
Rework checkout flow to precisely control what is fetched and checked
out.</li>
<li><a
href="65866b8ec2"><code>65866b8</code></a>
Merge pull request <a
href="https://redirect.github.com/namespacelabs/nscloud-checkout-action/issues/21">#21</a>
from namespacelabs/NSL-6774</li>
<li><a
href="ef7d6fcaeb"><code>ef7d6fc</code></a>
Correctly check out merge branches for PRs.</li>
<li>See full diff in <a
href="https://github.com/namespacelabs/nscloud-checkout-action/compare/v7...v8">compare
view</a></li>
</ul>
</details>
<br />


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.github/workflows/build-template.yml

@@ -73,7 +73,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha }}
       - name: Namespace Checkout
         if: endsWith(matrix.os, '-with-cache')
-        uses: namespacelabs/nscloud-checkout-action@v7
+        uses: namespacelabs/nscloud-checkout-action@v8
         with:
           ref: ${{ github.event.pull_request.head.sha }}
       - name: Open Nix shell once