chore: set up dependabot

[ROpdebee]

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[codecov]

Codecov Report

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@@           Coverage Diff            @@
##             main       #99   +/-   ##
========================================
  Coverage        ?   100.00%           
========================================
  Files           ?        27           
  Lines           ?       510           
  Branches        ?        91           
========================================
  Hits            ?       510           
  Misses          ?         0           
  Partials        ?         0           

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[github-actions]

This PR made no changes to the built userscripts. No new userscript versions deployed.