Bump sigstore/cosign-installer from 3.0.3 to 3.0.4 (#286)

Bumps
[sigstore/cosign-installer](https://github.com/sigstore/cosign-installer)
from 3.0.3 to 3.0.4.
<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>v3.0.4</h2>
<ul>
<li>Include fix for <a
href="https://redirect.github.com/sigstore/cosign-installer/pull/124">sigstore/cosign-installer#124</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/sigstore/cosign-installer/commit/03d0fecf172873164a163bbc64bed0f3bf114ed7"><code>03d0fec</code></a>
Fix unsafe evaluation of inputs.use-sudo (<a
href="https://redirect.github.com/sigstore/cosign-installer/issues/124">#124</a>)</li>
<li><a
href="https://github.com/sigstore/cosign-installer/commit/46b5db744906311fb5af96dec633d262d16dfb5b"><code>46b5db7</code></a>
use intermediate environment variables to avoid risks of script
injection (<a
href="https://redirect.github.com/sigstore/cosign-installer/issues/122">#122</a>)</li>
<li><a
href="https://github.com/sigstore/cosign-installer/commit/84448ba515b2a5ac9853582a471184394c67631b"><code>84448ba</code></a>
we should rely upon the digests not the tags, typos (<a
href="https://redirect.github.com/sigstore/cosign-installer/issues/121">#121</a>)</li>
<li>See full diff in <a
href="https://github.com/sigstore/cosign-installer/compare/v3.0.3...v3.0.4">compare
view</a></li>
</ul>
</details>
<br />


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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/helm-release.yaml

@@ -29,7 +29,7 @@ jobs:
           git config user.email "[email protected]"
 
       - name: Setup cosign
-        uses: sigstore/[email protected].3
+        uses: sigstore/[email protected].4
         with:
           cosign-release: v2.0.2