ci: dependabot increase pull request limit; group mochify packages

[YasharF]

Fix broken dependency update: mochify packages

Background

Mochify drivers have the mochify package as peer dependency. That means, when a new major of mochify is released if Dependabot tries to update just one of them at a time the update process is going to fail

Solution

Set a group for `@mochify/*" in Dependabot settings, so it bundles them together in a single PR.

This PR is also increasing the Dependabot PR limit so it wouldn't end up with a backlog of updates without PRs that can mask potential problems such as this in the future.

How to verify

I tested this in my fork and it created a single PR as YasharF#9

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (5f88086) to head (f654eda).
⚠️ Report is 64 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #309     +/-   ##
===========================================
  Coverage   100.00%   100.00%             
===========================================
  Files           28        29      +1     
  Lines          532      1619   +1087     
===========================================
+ Hits           532      1619   +1087     

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