build(deps): bump namespacelabs/nscloud-setup-buildx-action from 0.0.20 to 0.0.21 (#10308)

Bumps
[namespacelabs/nscloud-setup-buildx-action](https://github.com/namespacelabs/nscloud-setup-buildx-action)
from 0.0.20 to 0.0.21.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="a7e5254161"><code>a7e5254</code></a>
Adopt new wait command in action. (<a
href="https://redirect.github.com/namespacelabs/nscloud-setup-buildx-action/issues/12">#12</a>)</li>
<li>See full diff in <a
href="91c2e65377...a7e5254161">compare
view</a></li>
</ul>
</details>
<br />


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</details>

.github/workflows/test.yml

@@ -1083,7 +1083,7 @@ jobs:
         uses: namespacelabs/nscloud-setup@d1c625762f7c926a54bd39252efff0705fd11c64 # v0.0.10
 
       - name: Configure Namespace powered Buildx
-        uses: namespacelabs/nscloud-setup-buildx-action@91c2e6537780e3b092cb8476406be99a8f91bd5e # v0.0.20
+        uses: namespacelabs/nscloud-setup-buildx-action@a7e525416136ee2842da3c800e7067b72a27200e # v0.0.21
 
       - name: Download Source Tarball Artifacts
         uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0