MINOR: [CI] Bump actions/download-artifact from 4.1.7 to 4.1.8 (apach…

…e#44020)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4.1.7 to 4.1.8.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/actions/download-artifact/releases">actions/download-artifact's releases</a>.</em></p>
<blockquote>
<h2>v4.1.8</h2>
<h2>What's Changed</h2>
<ul>
<li>Update <code>@​actions/artifact</code> version, bump dependencies by <a href="https://github.com/robherley"><code>@​robherley</code></a> in <a href="https://redirect.github.com/actions/download-artifact/pull/341">actions/download-artifact#341</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/actions/download-artifact/compare/v4...v4.1.8">https://github.com/actions/download-artifact/compare/v4...v4.1.8</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/actions/download-artifact/commit/fa0a91b85d4f404e444e00e005971372dc801d16"><code>fa0a91b</code></a> Merge pull request <a href="https://redirect.github.com/actions/download-artifact/issues/341">#341</a> from actions/robherley/bump-pkgs</li>
<li><a href="https://github.com/actions/download-artifact/commit/b54d0883e196647f43ce531a3fc13b246cf908b6"><code>b54d088</code></a> Update <code>@​actions/artifact</code> version, bump dependencies</li>
<li>See full diff in <a href="https://github.com/actions/download-artifact/compare/v4.1.7...v4.1.8">compare view</a></li>
</ul>
</details>
<br />

[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=actions/download-artifact&package-manager=github_actions&previous-version=4.1.7&new-version=4.1.8)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

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Authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Signed-off-by: Sutou Kouhei <[email protected]>

.github/workflows/r.yml

@@ -332,7 +332,7 @@ jobs:
           echo "$HOME/.local/bin" >> $GITHUB_PATH
       - run: mkdir r/windows
       - name: Download artifacts
-        uses: actions/[email protected].7
+        uses: actions/[email protected].8
         with:
           name: libarrow-rtools40-ucrt64.zip
           path: r/windows