Bump com.diffplug.spotless:spotless-plugin-gradle from 6.15.0 to 6.16.0 (#7936)

Bumps
[com.diffplug.spotless:spotless-plugin-gradle](https://github.com/diffplug/spotless)
from 6.15.0 to 6.16.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="c4d612d125"><code>c4d612d</code></a>
Published gradle/6.16.0</li>
<li><a
href="78e0049812"><code>78e0049</code></a>
Published lib/2.36.0</li>
<li><a
href="39c84f2852"><code>39c84f2</code></a>
speedup npm install step for npm based formatters (<a
href="https://github-redirect.dependabot.com/diffplug/spotless/issues/1590">#1590</a>
fixes <a
href="https://github-redirect.dependabot.com/diffplug/spotless/issues/1480">#1480</a>
and <a
href="https://github-redirect.dependabot.com/diffplug/spotless/issues/1582">#1582</a>)</li>
<li><a
href="8ebb896075"><code>8ebb896</code></a>
Merge remote-tracking branch 'upstream/main' into
1480-speedup-npm-install-st...</li>
<li><a
href="78ccbc9f48"><code>78ccbc9</code></a>
1480: make TimedLogger package-private (PR feedback)</li>
<li><a
href="671622803e"><code>6716228</code></a>
Add <code>equoIde</code> task to make eclipse setup easier (<a
href="https://github-redirect.dependabot.com/diffplug/spotless/issues/1523">#1523</a>)</li>
<li><a
href="2a54d84752"><code>2a54d84</code></a>
Update changelogs.</li>
<li><a
href="74f2ee85c5"><code>74f2ee8</code></a>
Merge branch 'main' into feat/equo-ide</li>
<li><a
href="2872741126"><code>2872741</code></a>
Handle JSON with Array as root (<a
href="https://github-redirect.dependabot.com/diffplug/spotless/issues/1585">#1585</a>)</li>
<li><a
href="e2f7f7670c"><code>e2f7f76</code></a>
Merge branch 'main' into JacksonJasonShouldHandleTopArray</li>
<li>Additional commits viewable in <a
href="https://github.com/diffplug/spotless/compare/gradle/6.15.0...gradle/6.16.0">compare
view</a></li>
</ul>
</details>
<br />


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conventions/build.gradle.kts

@@ -52,7 +52,7 @@ dependencies {
   implementation("org.apache.maven:maven-aether-provider:3.3.9")
 
   // When updating, update above in plugins too
-  implementation("com.diffplug.spotless:spotless-plugin-gradle:6.15.0")
+  implementation("com.diffplug.spotless:spotless-plugin-gradle:6.16.0")
   implementation("com.google.guava:guava:31.1-jre")
   implementation("gradle.plugin.com.google.protobuf:protobuf-gradle-plugin:0.8.18")
   implementation("gradle.plugin.com.github.johnrengelman:shadow:7.1.2")