Add dependabot for github actions.

[tobiasraabe]

Committed via https://github.com/asottile/all-repos

[codecov]

Codecov Report

Merging #22 (0361d10) into main (d6cc6f3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #22   +/-   ##
=======================================
  Coverage   99.25%   99.25%           
=======================================
  Files          16       16           
  Lines         535      535           
=======================================
  Hits          531      531           
  Misses          4        4           

Flag	Coverage Δ
end_to_end	96.82% <ø> (ø)
unit	53.27% <ø> (ø)

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