Update doobie to 1.0.0-RC6

Author: neko-kai

build.sbt

@@ -6,7 +6,7 @@ val V = new {
   val scalatest     = "3.2.18"
   val scalacheck    = "1.18.0"
   val http4s        = "0.23.29"
-  val doobie        = "1.0.0-RC5"
+  val doobie        = "1.0.0-RC6"
   val catsCore      = "2.12.0"
   val zio           = "2.1.13"
   val zioCats       = "23.0.0.8"