Bump spotless-plugin-gradle from 6.11.0 to 6.12.0 in /conventions (#7315)

Bumps [spotless-plugin-gradle](https://github.com/diffplug/spotless)
from 6.11.0 to 6.12.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="a31bba3e5a"><code>a31bba3</code></a>
Published gradle/6.12.0</li>
<li><a
href="f2f8b08dd8"><code>f2f8b08</code></a>
Published lib/2.31.0</li>
<li><a
href="d7d7ecce6d"><code>d7d7ecc</code></a>
Fix publishing by bumping spotless-changelog to latest.</li>
<li><a
href="9ecec25cd0"><code>9ecec25</code></a>
Bump default <code>palantir-java-format</code> version to latest
<code>2.10</code> -&gt; <code>2.28</code> (<a
href="https://github-redirect.dependabot.com/diffplug/spotless/issues/1329">#1329</a>)</li>
<li><a
href="fd70d743f4"><code>fd70d74</code></a>
Fix CI</li>
<li><a
href="82e0aa2230"><code>82e0aa2</code></a>
Merge branch 'main' into
renovate/com.palantir.javaformat-palantir-java-forma...</li>
<li><a
href="7f73ad277b"><code>7f73ad2</code></a>
Merge branch 'main' into
renovate/com.palantir.javaformat-palantir-java-forma...</li>
<li><a
href="14c304453d"><code>14c3044</code></a>
fix(deps): update dependency org.cqfn.diktat:diktat-rules to v1.2.4.2
(<a
href="https://github-redirect.dependabot.com/diffplug/spotless/issues/1393">#1393</a>)</li>
<li><a
href="b047275f1c"><code>b047275</code></a>
Merge branch 'main' into renovate/ver_diktat</li>
<li><a
href="12c88cf0b6"><code>12c88cf</code></a>
fix(deps): update dependency org.scalameta:scalafmt-core_2.13 to v3.6.1
(<a
href="https://github-redirect.dependabot.com/diffplug/spotless/issues/1373">#1373</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/diffplug/spotless/compare/gradle/6.11.0...gradle/6.12.0">compare
view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=com.diffplug.spotless:spotless-plugin-gradle&package-manager=gradle&previous-version=6.11.0&new-version=6.12.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

You can trigger a rebase of this PR by commenting `@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits
that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after
your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge
and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating
it. You can achieve the same result by closing it manually
- `@dependabot ignore this major version` will close this PR and stop
Dependabot creating any more for this major version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop
Dependabot creating any more for this minor version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop
Dependabot creating any more for this dependency (unless you reopen the
PR or upgrade to it yourself)


</details>

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

conventions/build.gradle.kts

@@ -38,7 +38,7 @@ 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:6.11.0")
+  implementation("com.diffplug.spotless:spotless-plugin-gradle:6.12.0")
   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")