Update dependency org.jetbrains.kotlinx:kotlinx-coroutines-jdk8 to v1.9.0

Author: renovate[bot]

build.gradle.kts

@@ -21,7 +21,7 @@ repositories {
 dependencies {
     implementation("net.dv8tion:JDA:5.0.0-beta.18")
     implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.4")
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-jdk8:1.6.4")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-jdk8:1.9.0")
     implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor:1.6.4")
 
     implementation("org.slf4j:slf4j-api:2.0.5")