null safety

pubspec.lock

@@ -7,14 +7,14 @@ packages:
       name: _fe_analyzer_shared
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "22.0.0"
+    version: "25.0.0"
   analyzer:
     dependency: transitive
     description:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.1"
+    version: "2.2.0"
   args:
     dependency: transitive
     description:
@@ -28,7 +28,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.6.1"
+    version: "2.8.1"
   barcode_scan2:
     dependency: "direct main"
     description:
@@ -91,7 +91,7 @@ packages:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.1"
   cli_util:
     dependency: transitive
     description:
@@ -434,6 +434,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "9.1.0"
+  frontend_server_client:
+    dependency: transitive
+    description:
+      name: frontend_server_client
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.2"
   glob:
     dependency: transitive
     description:
@@ -531,7 +538,7 @@ packages:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0"
+    version: "1.7.0"
   mime:
     dependency: transitive
     description:
@@ -893,21 +900,21 @@ packages:
       name: test
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.16.8"
+    version: "1.17.10"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.0"
+    version: "0.4.2"
   test_core:
     dependency: transitive
     description:
       name: test_core
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.19"
+    version: "0.4.0"
   timeline_list:
     dependency: "direct main"
     description: