[ffigen] Bump coverallsapp/github-action from 1.2.4 to 2.0.0 (#543)

Bumps [coverallsapp/github-action](https://github.com/coverallsapp/github-action) from 1.2.4 to 2.0.0.
- [Release notes](https://github.com/coverallsapp/github-action/releases)
- [Commits](https://github.com/coverallsapp/github-action/compare/50c33ad324a9902697adbf2f92c22cf5023eacf1...67662d24394fd74bffcf7b462d1b432814159afd)

---
updated-dependencies:
- dependency-name: coverallsapp/github-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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