fix: Solve warnings from 3.10.0 analyzer (flame-engine#2532)

Just solves the warnings that the new Flutter version complains about (which makes us lose 10 points on pub).

Author: spydon

.github/workflows/cicd.yml

@@ -15,12 +15,10 @@ jobs:
       - uses: actions/checkout@v3
       - uses: subosito/flutter-action@v2
         with:
-          flutter-version: '3.7.1'
+          flutter-version: '3.10.0'
           channel: 'stable'
           cache: true
       - uses: bluefireteam/melos-action@main
-        with:
-          melos-version: '3.0.0-dev.0'
       - run: melos run format-check
 
   analyze:
@@ -29,11 +27,9 @@ jobs:
       - uses: actions/checkout@v3
       - uses: subosito/flutter-action@v2
         with:
-          flutter-version: '3.7.1'
+          flutter-version: '3.10.0'
           channel: 'stable'
       - uses: bluefireteam/melos-action@v2
-        with:
-          melos-version: '3.0.0-dev.0'
       - name: "Analyze"
         uses: invertase/github-action-dart-analyzer@v1
         with:
@@ -58,11 +54,9 @@ jobs:
       - uses: actions/checkout@v3
       - uses: subosito/flutter-action@v2
         with:
-          flutter-version: '3.7.1'
+          flutter-version: '3.10.0'
           channel: 'stable'
           cache: true
       - uses: bluefireteam/melos-action@main
-        with:
-          melos-version: '3.0.0-dev.0'
       - uses: bluefireteam/spec-action@main
   # END TESTING STAGE

doc/flame/examples/pubspec.yaml

@@ -4,7 +4,7 @@ version: 1.0.0
 publish_to: none
 
 environment:
-  sdk: ">=2.18.0 <3.0.0"
+  sdk: ">=2.18.0 <4.0.0"
   flutter: ">=3.3.0"
 
 dependencies: