Bump io.freefair.maven-central.validate-poms from 8.4 to 8.6

Bumps [io.freefair.maven-central.validate-poms](https://github.com/freefair/gradle-plugins) from 8.4 to 8.6.
- [Release notes](https://github.com/freefair/gradle-plugins/releases)
- [Commits](freefair/gradle-plugins@8.4...8.6)

---
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

@@ -12,7 +12,7 @@ plugins {
     id("io.freefair.javadoc-links") version "8.4"
     id("io.freefair.javadoc-utf-8") version "8.4"
     id("org.sonarqube") version "4.4.1.3373"
-    id("io.freefair.maven-central.validate-poms") version "8.4"
+    id("io.freefair.maven-central.validate-poms") version "8.6"
     id("com.github.ben-manes.versions") version "0.51.0"
     id("ru.vyarus.pom") version "2.2.2"
     id("io.codearte.nexus-staging") version "0.30.0"