[flutter] Update example lockfiles for 4.3.5

Author: badlogic

spine-flutter/example/pubspec.lock

@@ -169,7 +169,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "4.3.1"
+    version: "4.3.5"
   string_scanner:
     dependency: transitive
     description:

spine-flutter/test/pubspec.lock

@@ -329,7 +329,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "4.3.1"
+    version: "4.3.5"
   stack_trace:
     dependency: transitive
     description: