meta-*: bump layers/sw/meta-flutter from bf37f37 to 67d7a4d

Bumps [layers/sw/meta-flutter](https://github.com/meta-flutter/meta-flutter) from `bf37f37` to `67d7a4d`.
- [Release notes](https://github.com/meta-flutter/meta-flutter/releases)
- [Commits](meta-flutter/meta-flutter@bf37f37...67d7a4d)

---
updated-dependencies:
- dependency-name: layers/sw/meta-flutter
  dependency-version: 67d7a4d3dc1e688eb37f05e8f740aca59fb53b9a
  dependency-type: direct:production
...

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

Author: dependabot[bot]