Regenerate files with json_serializable v1.2.1 (dart-lang/pubspec_parse#22)

diff --git a/pkgs/pubspec_parse/lib/src/dependency.g.dart b/pkgs/pubspec_parse/lib/src/dependency.g.dart
index cba3364..7aee206 100644
--- a/pkgs/pubspec_parse/lib/src/dependency.g.dart
+++ b/pkgs/pubspec_parse/lib/src/dependency.g.dart
@@ -8,7 +8,8 @@
 
 SdkDependency _$SdkDependencyFromJson(Map json) {
   return $checkedNew('SdkDependency', json, () {
-    $checkKeys(json, requiredKeys: ['sdk'], disallowNullValues: ['sdk']);
+    $checkKeys(json,
+        requiredKeys: const ['sdk'], disallowNullValues: const ['sdk']);
     var val = SdkDependency($checkedConvert(json, 'sdk', (v) => v as String),
         version: $checkedConvert(json, 'version',
             (v) => v == null ? null : _constraintFromString(v as String)));
@@ -18,7 +19,8 @@
 
 GitDependency _$GitDependencyFromJson(Map json) {
   return $checkedNew('GitDependency', json, () {
-    $checkKeys(json, requiredKeys: ['url'], disallowNullValues: ['url']);
+    $checkKeys(json,
+        requiredKeys: const ['url'], disallowNullValues: const ['url']);
     var val = GitDependency(
         $checkedConvert(
             json, 'url', (v) => v == null ? null : parseGitUri(v as String)),
@@ -31,7 +33,8 @@
 HostedDependency _$HostedDependencyFromJson(Map json) {
   return $checkedNew('HostedDependency', json, () {
     $checkKeys(json,
-        allowedKeys: ['version', 'hosted'], disallowNullValues: ['hosted']);
+        allowedKeys: const ['version', 'hosted'],
+        disallowNullValues: const ['hosted']);
     var val = HostedDependency(
         version: $checkedConvert(json, 'version',
             (v) => v == null ? null : _constraintFromString(v as String)),
@@ -44,9 +47,9 @@
 HostedDetails _$HostedDetailsFromJson(Map json) {
   return $checkedNew('HostedDetails', json, () {
     $checkKeys(json,
-        allowedKeys: ['name', 'url'],
-        requiredKeys: ['name'],
-        disallowNullValues: ['name', 'url']);
+        allowedKeys: const ['name', 'url'],
+        requiredKeys: const ['name'],
+        disallowNullValues: const ['name', 'url']);
     var val = HostedDetails(
         $checkedConvert(json, 'name', (v) => v as String),
         $checkedConvert(
diff --git a/pkgs/pubspec_parse/lib/src/pubspec.g.dart b/pkgs/pubspec_parse/lib/src/pubspec.g.dart
index dfb0bcf..7ac66f7 100644
--- a/pkgs/pubspec_parse/lib/src/pubspec.g.dart
+++ b/pkgs/pubspec_parse/lib/src/pubspec.g.dart
@@ -27,7 +27,7 @@
         dependencyOverrides: $checkedConvert(
             json, 'dependency_overrides', (v) => parseDeps(v as Map)));
     return val;
-  }, fieldKeyMap: {
+  }, fieldKeyMap: const {
     'devDependencies': 'dev_dependencies',
     'dependencyOverrides': 'dependency_overrides'
   });
diff --git a/pkgs/pubspec_parse/pubspec.yaml b/pkgs/pubspec_parse/pubspec.yaml
index 490a6b2..2db643d 100644
--- a/pkgs/pubspec_parse/pubspec.yaml
+++ b/pkgs/pubspec_parse/pubspec.yaml
@@ -17,7 +17,7 @@
 
 dev_dependencies:
   build_runner: ^0.10.0
-  json_serializable: ^1.0.0
+  json_serializable: ^1.2.1
   path: ^1.5.1
   stack_trace: ^1.9.2
   test: ^1.0.0