Update dependency org.jetbrains.kotlinx:kotlinx-io-core to v0.8.1

Author: renovate-bot

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 agp = "8.7.1"
 kotlin = "2.0.21"
 ktlint-cli = "1.4.0"
-kotlinx-io = "0.5.4"
+kotlinx-io = "0.8.1"
 maven-publish = "0.30.0"
 spotless = "6.25.0"