Update rspec requirement from ~> 3.11.0 to ~> 3.12.0
Update rspec requirement from ~> 3.11.0 to ~> 3.12.0

Updates the requirements on [rspec](https://github.com/rspec/rspec-metagem) to permit the latest version.
- [Release notes](https://github.com/rspec/rspec-metagem/releases)
- [Commits](https://github.com/rspec/rspec-metagem/compare/v3.11.0...v3.12.0)

---
updated-dependencies:
- dependency-name: rspec
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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