Add Renovate configuration to the repository to handle dependencies updates

[mkniewallner]

Resolves #178.

PR Checklist

• A description of the changes is added to the description of this PR.
• If there is a related issue, make sure it is linked to this PR.
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

Description of changes

Add Renovate configuration (based on https://docs.renovatebot.com/configuration-options/) to the repository, to automate dependencies updates. If you are ok with adding it, once the PR is merged, it will be required to add the app to the repository through https://github.com/apps/renovate.

To get an idea of the dependencies that Renovate is able to find, you can take a look at mkniewallner#13.

[codecov-commenter]

Codecov Report

Merging #179 (383aca8) into main (91e0d2b) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main    #179   +/-   ##
=====================================
  Coverage   95.5%   95.5%           
=====================================
  Files         29      29           
  Lines        920     920           
  Branches     139     139           
=====================================
  Hits         879     879           
  Misses        27      27           
  Partials      14      14           

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.