Bump io.freefair.maven-central.validate-poms from 8.6 to 8.7.1 (#369)

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

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

Author: dependabot[bot]

build.gradle.kts

@@ -7,7 +7,7 @@ plugins {
   id("maven-publish")
   id("com.github.ben-manes.versions") version "0.51.0"
   id("net.ossindex.audit") version "0.4.11"
-  id("io.freefair.maven-central.validate-poms") version "8.6"
+  id("io.freefair.maven-central.validate-poms") version "8.7.1"
   id("io.github.gradle-nexus.publish-plugin") version "2.0.0"
 }