.github: replace dependabot with deps workflow

[mmcloughlin]

No description provided.

[codecov-commenter]

Codecov Report

Merging #277 (43b2721) into master (967e076) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #277   +/-   ##
=======================================
  Coverage   76.04%   76.04%           
=======================================
  Files          65       65           
  Lines       20591    20591           
=======================================
  Hits        15659    15659           
  Misses       4854     4854           
  Partials       78       78           

Flag	Coverage Δ
integration	11.84% <ø> (ø)
unittests	73.16% <ø> (ø)

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