Update doobie-core, doobie-postgres to 1.0.0-RC6 (#9)

Co-authored-by: horothesun-scala-steward[bot] <132169906+horothesun-scala-steward[bot]@users.noreply.github.com>

Author: horothesun-scala-steward[bot]

Main.scala

@@ -2,8 +2,8 @@
 //> using jvm temurin:21
 
 //> using dep org.typelevel::cats-effect:3.5.4
-//> using dep org.tpolecat::doobie-core:1.0.0-RC5
-//> using dep org.tpolecat::doobie-postgres:1.0.0-RC5
+//> using dep org.tpolecat::doobie-core:1.0.0-RC6
+//> using dep org.tpolecat::doobie-postgres:1.0.0-RC6
 
 //> using test.dep org.scalameta::munit:1.0.2
 //> using test.dep org.typelevel::munit-cats-effect:2.0.0