chore(deps): update plugin publishoncentral to v7 (#539)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

gradle/libs.versions.toml

@@ -37,5 +37,5 @@ xtext-web = [
 gitSemVer = "org.danilopianini.git-sensitive-semantic-versioning-gradle-plugin:3.1.7"
 kotlin-qa = "org.danilopianini.gradle-kotlin-qa:0.77.1"
 multiJvmTesting = "org.danilopianini.multi-jvm-test-plugin:3.0.0"
-publishOnCentral = "org.danilopianini.publish-on-central:6.0.1"
+publishOnCentral = "org.danilopianini.publish-on-central:7.0.0"
 shadowJar = "com.github.johnrengelman.shadow:8.1.1"