CI: Tell dependabot to update GH Actions

[olleolleolle]

This PR adds a configuration to tell Dependabot to update the versions used for some well-known GitHub Actions, such as checkout, in order to avoid deprecation warnings when those get too old. Documentation

[adomokos]

I like this! Can you please make it pass?

[adomokos]

I released v0.19.0, no more active support, this should pass when you rebase this branch with main.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.47%. Comparing base (746b239) to head (9d31ea4).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #248   +/-   ##
=======================================
  Coverage   99.47%   99.47%           
=======================================
  Files          29       29           
  Lines         766      766           
=======================================
  Hits          762      762           
  Misses          4        4           

Flag	Coverage Δ
unittests	99.47% <ø> (ø)

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[adomokos]

Thank you!