Bump sigstore/cosign-installer from 3.8.0 to 3.8.1 (#18185)

Bumps
[sigstore/cosign-installer](https://github.com/sigstore/cosign-installer)
from 3.8.0 to 3.8.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/sigstore/cosign-installer/releases">sigstore/cosign-installer's
releases</a>.</em></p>
<blockquote>
<h2>v3.8.1</h2>
<h2>What's Changed</h2>
<ul>
<li>use cosign 2.4.3 and other updates by <a
href="https://github.com/cpanato"><code>@​cpanato</code></a> in <a
href="https://redirect.github.com/sigstore/cosign-installer/pull/182">sigstore/cosign-installer#182</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/sigstore/cosign-installer/compare/v3...v3.8.1">https://github.com/sigstore/cosign-installer/compare/v3...v3.8.1</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="d7d6bc7722"><code>d7d6bc7</code></a>
use cosign 2.4.3 and other updates (<a
href="https://redirect.github.com/sigstore/cosign-installer/issues/182">#182</a>)</li>
<li>See full diff in <a
href="https://github.com/sigstore/cosign-installer/compare/v3.8.0...v3.8.1">compare
view</a></li>
</ul>
</details>
<br />


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.github/workflows/docker.yml

@@ -30,7 +30,7 @@ jobs:
         run: docker buildx inspect
 
       - name: Install Cosign
-        uses: sigstore/cosign-installer@v3.8.0
+        uses: sigstore/cosign-installer@v3.8.1
 
       - name: Checkout repository
         uses: actions/checkout@v4