build(deps): bump flutter_form_builder from 7.3.1 to 7.7.0

Bumps [flutter_form_builder](https://github.com/flutter-form-builder-ecosystem/flutter_form_builder) from 7.3.1 to 7.7.0.
- [Release notes](https://github.com/flutter-form-builder-ecosystem/flutter_form_builder/releases)
- [Changelog](https://github.com/flutter-form-builder-ecosystem/flutter_form_builder/blob/main/CHANGELOG.md)
- [Commits](flutter-form-builder-ecosystem/flutter_form_builder@flutter_form_builder-v7.3.1...7.7.0)

---
updated-dependencies:
- dependency-name: flutter_form_builder
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pubspec.lock

@@ -96,7 +96,7 @@ packages:
       name: flutter_form_builder
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "7.3.1"
+    version: "7.7.0"
   flutter_keyboard_visibility:
     dependency: transitive
     description: