chore(deps): Update dependency com.palantir.baseline:gradle-baseline-java to v6.9.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -14,5 +14,5 @@ indra-publishing-sonatype = { module = "net.kyori:indra-publishing-sonatype", ve
 nexus-publish = { module = "io.github.gradle-nexus:publish-plugin", version.ref = "nexus-publish" }
 errorprone-gradle = { module = "net.ltgt.gradle:gradle-errorprone-plugin", version.ref = "gradleErrorprone" }
 spotless = { module = "com.diffplug.spotless:spotless-plugin-gradle", version.ref = "spotless" }
-palantir-baseline = { module = "com.palantir.baseline:gradle-baseline-java", version = "6.4.0" }
+palantir-baseline = { module = "com.palantir.baseline:gradle-baseline-java", version = "6.9.0" }
 palantir-revapi = "com.palantir.gradle.revapi:gradle-revapi:1.8.0"