Update dependency com.github.DecentSoftware-eu.DecentHolograms:decentholograms to v2.9.9 (#260)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 # Plugins
 worldedit = "7.3.0"
 holographicdisplays = "3.0.5"
-decentholograms = "2.9.7"
+decentholograms = "2.9.9"
 paperlib = "1.0.8"
 
 # Gradle plugins