Update munit-cats-effect to 2.0.0-M5

Author: http4s-steward[bot]

build.sbt

@@ -21,7 +21,7 @@ val catsV = "2.10.0"
 val catsEffectV = "3.5.4"
 val fs2V = "3.6.1"
 val http4sV = "0.23.26"
-val munitCatsEffectV = "2.0.0-M4"
+val munitCatsEffectV = "2.0.0-M5"
 
 // Projects
 lazy val `http4s-session` =