Update dependency com.gradleup.shadow to v8.3.9 (#196)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ dynmap = "3.6"
 bstats = "3.0.0"
 
 # Gradle plugins
-shadow = "8.3.8"
+shadow = "8.3.9"
 bukkityml = "0.6.0"
 minotaur = "2.8.7"