Update 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?
• Have you successfully run brew man locally and committed any changes?

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I just can't get Dependabot to work properly here. It works fine in my file-for-file copy of the repo: https://github.com/Bo98/brew-deptest/pulls

[BrewTestBot]

Review period will end on 2021-02-18 at 21:07:48 UTC.

[BrewTestBot]

Review period ended.