Bump docker/build-push-action from 6.15.0 to 6.16.0 (#18397)

Bumps
[docker/build-push-action](https://github.com/docker/build-push-action)
from 6.15.0 to 6.16.0.
<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>v6.16.0</h2>
<ul>
<li>Handle no default attestations env var 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/1343">docker/build-push-action#1343</a></li>
<li>Only print secret keys in build summary output 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/1353">docker/build-push-action#1353</a></li>
<li>Bump <code>@​docker/actions-toolkit</code> from 0.56.0 to 0.59.0 in
<a
href="https://redirect.github.com/docker/build-push-action/pull/1352">docker/build-push-action#1352</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/docker/build-push-action/compare/v6.15.0...v6.16.0">https://github.com/docker/build-push-action/compare/v6.15.0...v6.16.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/docker/build-push-action/commit/14487ce63c7a62a4a324b0bfb37086795e31c6c1"><code>14487ce</code></a>
Merge pull request <a
href="https://redirect.github.com/docker/build-push-action/issues/1343">#1343</a>
from crazy-max/fix-no-default-attest</li>
<li><a
href="https://github.com/docker/build-push-action/commit/0ec91264d895acf7dfe05d54d8a3cc28f95b6346"><code>0ec9126</code></a>
Merge pull request <a
href="https://redirect.github.com/docker/build-push-action/issues/1366">#1366</a>
from crazy-max/pr-assign-author</li>
<li><a
href="https://github.com/docker/build-push-action/commit/b749522b90af1b517f52d8c1e67b2a965cea5eae"><code>b749522</code></a>
pr-assign-author workflow</li>
<li><a
href="https://github.com/docker/build-push-action/commit/c566248492c912e39910ac79e2f05a82260233a8"><code>c566248</code></a>
Merge pull request <a
href="https://redirect.github.com/docker/build-push-action/issues/1363">#1363</a>
from crazy-max/fix-codecov</li>
<li><a
href="https://github.com/docker/build-push-action/commit/13275dd76e44afdffdd61da8b8ae8e26ee11671f"><code>13275dd</code></a>
ci: fix missing source for codecov</li>
<li><a
href="https://github.com/docker/build-push-action/commit/67dc78bbaf388b3265f7e1c880e681f4b90d5f48"><code>67dc78b</code></a>
Merge pull request <a
href="https://redirect.github.com/docker/build-push-action/issues/1361">#1361</a>
from mschoettle/patch-1</li>
<li><a
href="https://github.com/docker/build-push-action/commit/0760504437ba8d0d98e7d5b625560bdede11b3b5"><code>0760504</code></a>
docs: add validating build configuration example</li>
<li><a
href="https://github.com/docker/build-push-action/commit/1c198f4467ce458288d816cabd773cd574f16977"><code>1c198f4</code></a>
chore: update generated content</li>
<li><a
href="https://github.com/docker/build-push-action/commit/288d9e2e4a70c24711ba959b94c2209b9205347e"><code>288d9e2</code></a>
handle no default attestations env var</li>
<li><a
href="https://github.com/docker/build-push-action/commit/88844b95d8cbbb41035fa9c94e5967a33b92db78"><code>88844b9</code></a>
Merge pull request <a
href="https://redirect.github.com/docker/build-push-action/issues/1353">#1353</a>
from crazy-max/summary-secret-keys</li>
<li>Additional commits viewable in <a
href="https://github.com/docker/build-push-action/compare/471d1dc4e07e5cdedd4c2171150001c434f0b7a4...14487ce63c7a62a4a324b0bfb37086795e31c6c1">compare
view</a></li>
</ul>
</details>
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