Bump built_value from 8.1.4 to 8.2.2 in /jsonexample (#1156)

jsonexample/pubspec.lock

@@ -91,7 +91,7 @@ packages:
       name: built_value
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "8.1.4"
+    version: "8.2.2"
   built_value_generator:
     dependency: "direct dev"
     description:

jsonexample/pubspec.yaml

@@ -8,7 +8,7 @@ environment:
 dependencies:
   json_annotation: ^4.0.0
   built_collection: ^5.0.0
-  built_value: ^8.0.0
+  built_value: ^8.2.2
 
   flutter:
     sdk: flutter