Update ConcurrentUtil to 0.0.6

Fixes #13275

See
- https://github.com/Tuinity/ConcurrentUtil/releases/tag/v0.0.6
- Tuinity/ConcurrentUtil@42e72d7

Author: Spottedleaf

paper-server/build.gradle.kts

@@ -128,7 +128,7 @@ abstract class MockitoAgentProvider : CommandLineArgumentProvider {
 
 dependencies {
     implementation(project(":paper-api"))
-    implementation("ca.spottedleaf:concurrentutil:0.0.5")
+    implementation("ca.spottedleaf:concurrentutil:0.0.6")
     implementation("org.jline:jline-terminal-ffm:3.27.1") // use ffm on java 22+
     implementation("org.jline:jline-terminal-jni:3.27.1") // fall back to jni on java 21
     implementation("net.minecrell:terminalconsoleappender:1.3.0")