Update cats-effect to 3.7.1 (#367)

Author: http4s-steward[bot]

build.sbt

@@ -19,7 +19,7 @@ ThisBuild / startYear := Some(2024)
 val Scala213Cond = s"matrix.scala == '$Scala213'"
 
 val catsV = "2.13.0"
-val catsEffectV = "3.7.0"
+val catsEffectV = "3.7.1"
 val fs2V = "3.6.1"
 val http4sV = "0.23.34"
 val munitCatsEffectV = "2.2.0"