Fix empty gem RBIs for non-vendored dependencies

[Bo98]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

---

Added logic in sorbet/tapioca/require to require all gems that appear in Gemfile.lock (first commit) and then regenerated all gem RBIs (second commit).

[BrewTestBot]

Review period will end on 2021-09-13 at 20:31:56 UTC.

[BrewTestBot]

Review period ended.