Use default dispatcher for hiccup coroutine, see Kotlin/kotlinx.coroutines#840

Author: anti-social

src/jvmMain/kotlin/dev/evo/prometheus/hiccup/HiccupMetricsJvm.kt

@@ -1,9 +1,8 @@
 package dev.evo.prometheus.hiccup
 
-import kotlinx.coroutines.newSingleThreadContext
+import kotlinx.coroutines.Dispatchers
 import kotlin.coroutines.CoroutineContext
 
-// FIXME: Dispatchers.Default consumes too much CPU with tight delay
+// TODO: Check high CPU consumption
 // See https://github.com/Kotlin/kotlinx.coroutines/issues/840
-@UseExperimental(kotlinx.coroutines.ObsoleteCoroutinesApi::class)
-actual val hiccupCoroutineContext: CoroutineContext = newSingleThreadContext("hiccup-thread")
+actual val hiccupCoroutineContext: CoroutineContext = Dispatchers.Default