build: Update plugin shadow to v7.1.1 (#63)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -11,7 +11,7 @@ dynmap = "3.2-beta-1"
 bstats = "2.2.1"
 
 # Gradle plugins
-shadow = "7.1.0"
+shadow = "7.1.1"
 bukkityml = "0.5.1"
 
 [libraries]