fix: Not enough restrictive StrictEqual instance

Issue was blocking migration to Scala 3.3.3 due to a compilation error.

build.sc

@@ -7,7 +7,7 @@ import mill._, define._, api.Result
 import scalalib._, scalalib.scalafmt._, scalalib.publish._, scalajslib._, scalanativelib._
 
 object versions {
-  val scala = "3.3.1"
+  val scala = "3.3.3"
   val scalaJS = "1.13.2"
   val scalaNative = "0.4.15"
 }

main/src/io/github/iltotore/iron/constraint/any.scala

@@ -184,12 +184,14 @@ object any:
 
   object StrictEqual:
 
-    private trait StrictEqualConstraint[A, V] extends Constraint[A, StrictEqual[V]]:
+    trait StrictEqualConstraint[A, V] extends Constraint[A, StrictEqual[V]]:
       override inline def message: String = "Should strictly equal to " + stringValue[V]
 
-    inline given [A, V]: StrictEqualConstraint[A, V] with
+    class AnyStrictEqualConstraint[A, V] extends StrictEqualConstraint[A, V]:
       override inline def test(value: A): Boolean = value == constValue[V]
 
+    inline given [A, V](using inline v: ValueOf[V]): AnyStrictEqualConstraint[A, V] = new AnyStrictEqualConstraint
+
     inline given bigDecimalDouble[V <: Float | Double]: StrictEqualConstraint[BigDecimal, V] with
       override inline def test(value: BigDecimal): Boolean = value == BigDecimal(doubleValue[V])