Bump coverallsapp/github-action from 1.2.4 to 2.1.0

Bump coverallsapp/github-action from 1.2.4 to 2.1.0

Bumps [coverallsapp/github-action](https://github.com/coverallsapp/github-action) from 1.2.4 to 2.1.0.
- [Release notes](https://github.com/coverallsapp/github-action/releases)
- [Commits](https://github.com/coverallsapp/github-action/compare/v1.2.4...v2.1.0)

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

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

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20699)