simplytranslate - bump flutter

metadata/com.simplytranslate_mobile.yml

@@ -121,14 +121,18 @@ Builds:
     commit: 5b6b351a6d139bd9f73f2a00bb6c3df355b8702a
     output: build/app/outputs/apk/fdroid/release/app-fdroid-release.apk
     srclibs:
-      - flutter@2.10.0
+      - flutter@3.10.2
     rm:
       - .vscode
-      - ios
-    prebuild: sed -i -e 's|git@github.com:|https://github.com/|' pubspec.lock pubspec.yaml
-    build:
+    prebuild:
+      - sed -i -e 's|git@github.com:|https://github.com/|' pubspec.lock pubspec.yaml
+      - export PUB_CACHE=$(pwd)/.pub-cache
       - $$flutter$$/bin/flutter config --no-analytics
       - $$flutter$$/bin/flutter packages pub get
+    scandelete:
+      - .pub-cache
+    build:
+      - export PUB_CACHE=$(pwd)/.pub-cache
       - $$flutter$$/bin/flutter build apk --flavor fdroid
 
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