Bump json_annotation from 4.4.0 to 4.5.0 in /jsonexample (#1163)

jsonexample/pubspec.lock

@@ -255,14 +255,14 @@ packages:
       name: json_annotation
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.4.0"
+    version: "4.5.0"
   json_serializable:
     dependency: "direct dev"
     description:
       name: json_serializable
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.1.6"
+    version: "6.2.0"
   lints:
     dependency: transitive
     description:

jsonexample/pubspec.yaml

@@ -6,7 +6,7 @@ environment:
   sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
-  json_annotation: ^4.0.0
+  json_annotation: ^4.5.0
   built_collection: ^5.0.0
   built_value: ^8.2.2