Update dependency it.unimi.dsi:fastutil to v8.5.15

gradle/libs.versions.toml

@@ -64,7 +64,7 @@ oshi = "com.github.oshi:oshi-core:6.6.5"
 guava = "com.google.guava:guava:33.3.1-jre"
 gson = "com.google.code.gson:gson:2.11.0"
 pf4j = "org.pf4j:pf4j:3.12.1"
-fastutil = "it.unimi.dsi:fastutil:8.5.14"
+fastutil = "it.unimi.dsi:fastutil:8.5.15"
 caffeine = "com.github.ben-manes.caffeine:caffeine:3.1.8"
 jetbrains-annotations = "org.jetbrains:annotations:26.0.1"
 classtransform-mixinstranslator = { module = "net.lenni0451.classtransform:mixinstranslator", version.ref = "classtransform" }