Bump docker/build-push-action from 6.7.0 to 6.8.0 in the ci_dependencies group (#5863)

Bumps the ci_dependencies group with 1 update:
[docker/build-push-action](https://github.com/docker/build-push-action).

Updates `docker/build-push-action` from 6.7.0 to 6.8.0
<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>v6.8.0</h2>
<ul>
<li>Bump <code>@​docker/actions-toolkit</code> from 0.37.1 to 0.38.0 in
<a
href="https://redirect.github.com/docker/build-push-action/pull/1230">docker/build-push-action#1230</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/docker/build-push-action/compare/v6.7.0...v6.8.0">https://github.com/docker/build-push-action/compare/v6.7.0...v6.8.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/docker/build-push-action/commit/32945a339266b759abcbdc89316275140b0fc960"><code>32945a3</code></a>
Merge pull request <a
href="https://redirect.github.com/docker/build-push-action/issues/1230">#1230</a>
from docker/dependabot/npm_and_yarn/docker/actions-t...</li>
<li><a
href="https://github.com/docker/build-push-action/commit/e0fe9cf0f26132beab7b62929bd647eef9e7df31"><code>e0fe9cf</code></a>
chore: update generated content</li>
<li><a
href="https://github.com/docker/build-push-action/commit/8f1ff6bf9a836299c21b10f942be49efb52a832c"><code>8f1ff6b</code></a>
chore(deps): Bump <code>@​docker/actions-toolkit</code> from 0.37.1 to
0.38.0</li>
<li>See full diff in <a
href="https://github.com/docker/build-push-action/compare/5cd11c3a4ced054e52742c5fd54dca954e0edd85...32945a339266b759abcbdc89316275140b0fc960">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=6.7.0&new-version=6.8.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

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