Update flutter version

[jithware]

For application, update https://github.com/jithware/brethap/blob/master/pubspec.yaml

...
flutter: ^3.3.2
...

For github workflows, update https://github.com/jithware/brethap/blob/master/.github/workflows/flutter.yml

...
 with:
        flutter-version: '3.3.2'
...

For f-droid build, update https://gitlab.com/fdroid/fdroiddata/-/blob/master/metadata/com.jithware.brethap.yml [^1]

See docs at https://www.f-droid.org/en/docs/Build_Metadata_Reference/#Builds for more info.

...
Builds:
...
    srclibs:
      - flutter@3.3.2 
...

[^1]: fdroid flutter upgrade no longer uses srclibs as described above and has switched to submodules. See README.md for more info.*

[jithware]

While update f-droid build, add translation url: https://github.com/jithware/brethap/discussions/52

[jithware]

Submitted merge request: https://gitlab.com/fdroid/fdroiddata/-/merge_requests/11774

[jithware]

In release version >= 1.7.2+55

[jithware]

Submitted merge request: https://gitlab.com/fdroid/fdroiddata/-/merge_requests/12151

[jithware]

Submitted merge request: https://gitlab.com/fdroid/fdroiddata/-/merge_requests/12158

[jithware]

In release >= 1.7.7+76

[jithware]

Flutter version 3.7.1 in release >= 1.7.11+90

[jithware]

Flutter version 3.7.5 in release 1.7.13+96