Update flutter to 3.29

The translations are not stored in a synthetic package anymore, but the
files are just copied to a specific folder so it can be more easily imported

Also, flutter_barcode_scanner was replaced by simple_barcode_scanner since
the first hasn't been updated in 3 years and was already causing problems
for some time

.github/workflows/build-release.yml

@@ -26,7 +26,7 @@ jobs:
         uses: subosito/flutter-action@v2
         with:
           channel: stable
-          flutter-version: 3.27.x
+          flutter-version: 3.29.x
 
       - name: Flutter info
         run: |

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
         with:
           cache: true
           channel: 'stable'
-          flutter-version: '3.27.x'
+          flutter-version: '3.29.x'
 
       - run: dart --version
       - run: flutter --version