Bump ffigen from 6.1.2 to 7.0.0 (#45)

Bumps [ffigen](https://github.com/dart-lang/ffigen) from 6.1.2 to 7.0.0.
- [Release notes](https://github.com/dart-lang/ffigen/releases)
- [Changelog](https://github.com/dart-lang/ffigen/blob/master/CHANGELOG.md)
- [Commits](dart-archive/ffigen@v6.1.2...v7.0.0)

---
updated-dependencies:
- dependency-name: ffigen
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pubspec.yaml

@@ -33,7 +33,7 @@ dependencies:
     sdk: flutter
 
 dev_dependencies:
-  ffigen: ^6.0.0
+  ffigen: ^7.0.0
   test: ^1.16.0
   yaml: ^3.0.0
   flutter_lints: ^2.0.0