Bump io.freefair.maven-central.validate-poms from 8.6 to 8.7.1

Bumps [io.freefair.maven-central.validate-poms](https:/freefair/gradle-plugins) from 8.6 to 8.7.1.
- [Release notes](https:/freefair/gradle-plugins/releases)
- [Commits](freefair/gradle-plugins@8.6...8.7.1)

---
updated-dependencies:
- dependency-name: io.freefair.maven-central.validate-poms
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle.kts

@@ -11,7 +11,7 @@ plugins {
  id("net.ossindex.audit") version "0.4.11"
  id("com.gradle.plugin-publish") version "1.2.1"
  id("io.github.gradle-nexus.publish-plugin") version "1.2.0"
- id("io.freefair.maven-central.validate-poms") version "8.6"
+ id("io.freefair.maven-central.validate-poms") version "8.7.1"
 }
 
 val dependencyVersions = listOf<String>(