Update dependency com.diffplug.spotless to v8.9.0

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -81,7 +81,7 @@ shotVersion = "6.1.0"
 slfj = "2.0.18"
 splash-screen = "1.2.0"
 spotbugsGradlePlugin = "6.5.8"
-spotless = "8.8.0"
+spotless = "8.9.0"
 stateless4jVersion = "2.6.0"
 webkitVersion = "1.16.0"
 workRuntime = "2.11.2"