Upgrade Swift to 5.

PiperOrigin-RevId: 366081670

Author: Jeff Verkoeyen

components/NavigationBar/examples/NavigationBarTypicalUseExample.swift

@@ -159,7 +159,7 @@ class ExampleInstructionsViewNavigationBarTypicalUseSwift: UIView {
     instructionsAttributedString.addAttributes(
       instructionsDictionary1,
       range: NSMakeRange(0, 11))
-    let endLength = instructionText.characters.count - 11
+    let endLength = instructionText.count - 11
     instructionsAttributedString.addAttributes(
       instructionsDictionary2,
       range: NSMakeRange(11, endLength))