ci(deps): bump docker/build-push-action from 6.3.0 to 6.4.0 (#371)

Bumps
[docker/build-push-action](https://github.com/docker/build-push-action)
from 6.3.0 to 6.4.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/docker/build-push-action/releases">docker/build-push-action's
releases</a>.</em></p>
<blockquote>
<h2>v6.4.0</h2>
<ul>
<li>Set <code>repository</code> and <code>ghtoken</code> attributes for
<a
href="https://docs.docker.com/build/cache/backends/gha/#avoid-github-actions-cache-api-throttling">GitHub
Actions cache backend</a> by <a
href="https://github.com/crazy-max"><code>@​crazy-max</code></a> in <a
href="https://redirect.github.com/docker/build-push-action/pull/1133">docker/build-push-action#1133</a></li>
<li>Bump <code>@​docker/actions-toolkit</code> from 0.31.0 to 0.33.0 in
<a
href="https://redirect.github.com/docker/build-push-action/pull/1179">docker/build-push-action#1179</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/docker/build-push-action/compare/v6.3.0...v6.4.0">https://github.com/docker/build-push-action/compare/v6.3.0...v6.4.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/docker/build-push-action/commit/a254f8ca60a858f3136a2f1f23a60969f2c402dd"><code>a254f8c</code></a>
Merge pull request <a
href="https://redirect.github.com/docker/build-push-action/issues/1179">#1179</a>
from docker/dependabot/npm_and_yarn/docker/actions-t...</li>
<li><a
href="https://github.com/docker/build-push-action/commit/94dae62c7865868ec9e16d6979bc908b3b5007c1"><code>94dae62</code></a>
chore: update generated content</li>
<li><a
href="https://github.com/docker/build-push-action/commit/267a69d6cc0770a2fc4de286d0a3e5d415c23282"><code>267a69d</code></a>
chore(deps): Bump <code>@​docker/actions-toolkit</code> from 0.31.0 to
0.33.0</li>
<li><a
href="https://github.com/docker/build-push-action/commit/f23fb2a7cbf316a4a4fb482ed83e91a500062b1e"><code>f23fb2a</code></a>
Merge pull request <a
href="https://redirect.github.com/docker/build-push-action/issues/1133">#1133</a>
from crazy-max/gha-cache-to</li>
<li><a
href="https://github.com/docker/build-push-action/commit/ef76d100ee7cf15fbc06bb785a10941cca3e9a58"><code>ef76d10</code></a>
chore: update generated content</li>
<li><a
href="https://github.com/docker/build-push-action/commit/522345f555207803568057b1b01d3120964b92e2"><code>522345f</code></a>
set repository and ghtoken attributes for gha cache type</li>
<li>See full diff in <a
href="https://github.com/docker/build-push-action/compare/1a162644f9a7e87d8f4b053101d1d9a712edc18c...a254f8ca60a858f3136a2f1f23a60969f2c402dd">compare
view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=docker/build-push-action&package-manager=github_actions&previous-version=6.3.0&new-version=6.4.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

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</details>

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

.github/workflows/rootfs.yaml

@@ -44,7 +44,7 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@4fd812986e6c8c2a69e18311145f9371337f27d4 # v3.4.0
       - name: Build Image
-        uses: docker/build-push-action@1a162644f9a7e87d8f4b053101d1d9a712edc18c # v6.3.0
+        uses: docker/build-push-action@a254f8ca60a858f3136a2f1f23a60969f2c402dd # v6.4.0
         with:
           platforms: linux/${{ matrix.arch }}
           push: false