chore: Upgrade to scala 3.6.4

Author: rlemaitre

build.sbt

@@ -31,9 +31,10 @@ ThisBuild / tlCiDependencyGraphJob   := true
 ThisBuild / autoAPIMappings          := true
 
 lazy val sharedSettings = Seq(
-  scalaVersion   := versions.scala,
-  scalacOptions ++= Seq(
-    "-source:3.7"
+  scalacOptions ++= List(
+    "-Yexplicit-nulls",
+    "-source",
+    "3.7"
   ),
   libraryDependencies ++= Seq(
     "org.scalameta" %% "munit" % versions.munit.core % Test

modules/core/src/main/scala/pillars/Logging.scala

@@ -9,9 +9,6 @@ import cats.effect.*
 import cats.syntax.all.*
 import fs2.io.file.Path
 import io.circe.*
-import io.circe.Codec
-import io.circe.Decoder
-import io.circe.Encoder
 import io.circe.derivation.Configuration
 import io.circe.syntax.*
 import io.github.iltotore.iron.*

modules/core/src/main/scala/pillars/probes.scala

@@ -11,8 +11,6 @@ import cats.effect.std.MapRef
 import cats.syntax.all.*
 import fs2.Stream
 import io.circe.*
-import io.circe.Decoder
-import io.circe.Encoder
 import io.circe.derivation.Configuration
 import io.github.iltotore.iron.*
 import io.github.iltotore.iron.constraint.all.*

modules/example/src/main/scala/example/app.scala

@@ -11,7 +11,6 @@ import pillars.*
 import pillars.db.*
 import pillars.db.migrations.*
 import pillars.flags.*
-import pillars.flags.flag
 import pillars.httpclient.*
 import skunk.*
 import skunk.codec.all.*

project/Dependencies.scala

@@ -1,7 +1,7 @@
 import sbt.*
 
 object versions {
-    val scala            = "3.6.3"
+    val scala            = "3.6.4"
     // Dependencies
     val cats             = "2.13.0"
     val catsEffect       = "3.5.7"