Update zio to 2.1.8 (bitlap#40)

Author: scala-steward

build.sbt

@@ -14,7 +14,7 @@ val elVersion                    = "5.0.0"
 val jodaConvertVersion           = "2.2.3"
 val jodaTimeVersion              = "2.12.7"
 val specs2Version                = "4.20.8"
-val zioVersion                   = "2.1.7"
+val zioVersion                   = "2.1.8"
 val `example-dependency-version` = "1.0.0-RC1"
 val supportCrossVersionList      = Seq(scala3_Version, scala2_13Version)