remove deprecated usage of ⇒

compiler produced warning:
"The unicode arrow `⇒` is deprecated, use `=>` instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code"

Author: unkarjedy

src/main/scala/GivenInstances.scala

@@ -12,17 +12,17 @@ object GivenInstances:
 
     def apply[A](using parser: StringParser[A]): StringParser[A] = parser
 
-    private def baseParser[A](f: String ⇒ Try[A]): StringParser[A] = new StringParser[A] {
+    private def baseParser[A](f: String => Try[A]): StringParser[A] = new StringParser[A] {
       override def parse(s: String): Try[A] = f(s)
     }
 
     given stringParser: StringParser[String] = baseParser(Success(_))
-    given intParser: StringParser[Int] = baseParser(s ⇒ Try(s.toInt))
+    given intParser: StringParser[Int] = baseParser(s => Try(s.toInt))
 
     given optionParser[A](using parser: => StringParser[A]): StringParser[Option[A]] = new StringParser[Option[A]] {
       override def parse(s: String): Try[Option[A]] = s match
-        case "" ⇒ Success(None) // implicit parser not used.
-        case str ⇒ parser.parse(str).map(x ⇒ Some(x)) // implicit parser is evaluated at here
+        case "" => Success(None) // implicit parser not used.
+        case str => parser.parse(str).map(x => Some(x)) // implicit parser is evaluated at here
     }
 
   def test(): Unit =