Make _enumerateDatesStep fileprivate again

Author: hristost

Sources/FoundationEssentials/Calendar/Calendar_Enumerate.swift

@@ -507,13 +507,13 @@ extension Calendar {
     }
 
     // Returns nil if there was no result. It's up to the caller to decide what to do about that (try again, or cancel).
-    internal func _enumerateDatesStep(startingAfter start: Date,
-                                      matching matchingComponents: DateComponents,
-                                      matchingPolicy: MatchingPolicy,
-                                      repeatedTimePolicy: RepeatedTimePolicy,
-                                      direction: SearchDirection,
-                                      inSearchingDate searchingDate: Date,
-                                      previouslyReturnedMatchDate: Date?) throws -> SearchStepResult {
+    fileprivate func _enumerateDatesStep(startingAfter start: Date,
+                                         matching matchingComponents: DateComponents,
+                                         matchingPolicy: MatchingPolicy,
+                                         repeatedTimePolicy: RepeatedTimePolicy,
+                                         direction: SearchDirection,
+                                         inSearchingDate searchingDate: Date,
+                                         previouslyReturnedMatchDate: Date?) throws -> SearchStepResult {
 
         // Step A: Call helper method that does the searching