Update Rubygems to 3.6.1 and Bundler to 2.6.1

[deivid-rodriguez]

What are you trying to accomplish?

Make sure new versions of Bundler & RubyGems play nice with Dependabot.

Anything you want to highlight for special attention from reviewers?

Bundler 2.6.0 reverted the changes in the most recent 2.5.x that affected Dependabot, see #10746. We should now be fine in that regard at least.

How will you know you've accomplished your goal?

CI passes.

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.

[deivid-rodriguez]

Bundler 2.6.1 caused an issue with tapioca. I proposed a patch to tapioca to fix it. If that's merged and released, upgrading should fix the tapioca job.

[deivid-rodriguez]

Everything seems fine other than the tapioca issue! 🎉