[flutter] Upgrade dependencies.

spine-flutter/example/pubspec.lock

@@ -211,5 +211,5 @@ packages:
     source: hosted
     version: "0.7.4"
 sdks:
-  dart: ">=2.18.0 <4.0.0"
-  flutter: ">=3.7.0"
+  dart: ">=2.18.0 <3.0.0"
+  flutter: ">=3.7.3"

spine-flutter/example/pubspec.yaml

@@ -5,7 +5,7 @@ version: 1.0.0+1
 
 environment:
   sdk: ">=2.17.6 <3.0.0"
-  flutter: ">=3.7.0"
+  flutter: ">=3.7.3"
 
 dependencies:
   flutter:

spine-flutter/pubspec.yaml

@@ -8,7 +8,7 @@ documentation: https://esotericsoftware.com/spine-flutter
 
 environment:
   sdk: ">=2.17.6 <3.0.0"
-  flutter: ">=3.7.0"
+  flutter: ">=3.7.3"
 
 dependencies:
   flutter:
@@ -16,16 +16,14 @@ dependencies:
   ffi: ^2.0.1
   web_ffi_fork: ^0.7.4
   inject_js: ^2.0.0
-  js: ^0.6.3
-  meta: ^1.3.0
+  js: ^0.6.5
+  meta: ^1.8.0
   http: ^0.13.5
   path: ^1.8.2
   raw_image_provider: ^0.2.0
 
 dev_dependencies:
-  ffigen: ^6.1.2
-  flutter_test:
-    sdk: flutter
+  ffigen: ^7.2.6
   flutter_lints: ^2.0.0
 
 flutter: