Have dependabot also monitor actions

[joshuagl]

Have dependabot monitor our GitHub Actions for updates too

Description of the changes being introduced by the pull request:

Please verify and check that the pull request fulfills the following
requirements:

• The code follows the Code Style Guidelines
• Tests have been added for the bug fix or new feature
• Docs have been added for the bug fix or new feature

[coveralls]

Pull Request Test Coverage Report for Build 1212852571

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 97.623%

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Totals
Change from base Build 1206092781:	0.0%
Covered Lines:	3744
Relevant Lines:	3797

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💛 - Coveralls

[jku]

I assume this means that when we have "uses: actions/checkout@v2", dependabot will inform us if github releases v3?

sounds good to me!