ci(flatpak): hardcode flutter version

ts garbage

.github/workflows/build.yml

@@ -392,8 +392,6 @@ jobs:
         run: |
           # Extract version from pubspec.yaml (e.g., "1.3.1+10" -> "1.3.1")
           VERSION=$(grep '^version:' pubspec.yaml | sed 's/version: //' | sed 's/+.*//' | tr -d ' ')
-          # Extract Flutter SDK version from pubspec.yaml (e.g., "^3.8.1" -> "3.8.1")
-          FLUTTER_VERSION=$(grep -A1 '^environment:' pubspec.yaml | grep 'sdk:' | sed 's/.*: *//' | sed 's/\^//' | tr -d ' ')
           DATE=$(date -u +%Y-%m-%d)
           COMMIT_SHA=$(git rev-parse HEAD)
 
@@ -408,7 +406,6 @@ jobs:
 
           # Replace placeholders in manifest
           sed -i "s|{{COMMIT_SHA}}|$COMMIT_SHA|g" linux/com.edde746.plezy.yml
-          sed -i "s|{{FLUTTER_VERSION}}|$FLUTTER_VERSION|g" linux/com.edde746.plezy.yml
 
       - name: Preprocess Flatpak manifest with flatpak-flutter
         run: |
@@ -437,7 +434,15 @@ jobs:
           path: plezy.flatpak
 
   create-release:
-    needs: [build-android, build-ios, build-macos, build-windows, build-linux, build-flatpak]
+    needs:
+      [
+        build-android,
+        build-ios,
+        build-macos,
+        build-windows,
+        build-linux,
+        build-flatpak,
+      ]
     runs-on: ubuntu-latest
     permissions:
       contents: write