Bump generic-array from 0.12.3 to 0.12.4 in /bridges/fuzz/storage-proof

Bumps [generic-array](https://github.com/fizyk20/generic-array) from 0.12.3 to 0.12.4.
- [Release notes](https://github.com/fizyk20/generic-array/releases)
- [Changelog](https://github.com/fizyk20/generic-array/blob/0.12.4/CHANGELOG.md)
- [Commits](fizyk20/generic-array@0.12.3...0.12.4)

---
updated-dependencies:
- dependency-name: generic-array
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>