Update doobie-core, doobie-postgres to 1.0.0-RC6 (#394)

Author: scala-steward

project/Dependencies.scala

@@ -10,7 +10,7 @@ object Dependencies {
     val MUnit = "1.0.0-M8"
     val CatsEffectMunit = "2.0.0-M3"
     val scalacheckEffectVersion = "2.0.0-M2"
-    val doobie = "1.0.0-RC5"
+    val doobie = "1.0.0-RC6"
     val circe = "0.14.10"
     val upickle = "3.2.0"
     val jsoniter = "2.30.1"