Bump kotlinx-io to 0.6.0 (#2933)

Author: krzema12

gradle/libs.versions.toml

@@ -13,7 +13,7 @@ guava = "31.1-jre"
 guava24 = "24.1.1-jre"
 jackson = "2.13.3"
 okio = "3.9.0"
-kotlinx-io = "0.4.0"
+kotlinx-io = "0.6.0"
 gson = "2.8.5"
 moshi = "1.15.1"
 kotlintest = "2.0.7"