Add dependabot for updating actions.

[tobiasraabe]

Changes

Provide a description and/or bullet points to describe the changes in this PR.

Todo

• Reference issues which can be closed due to this PR with "Closes #x".
• Review whether the documentation needs to be updated.
• Document PR in CHANGES.rst.

[codecov]

Codecov Report

Merging #13 (c21f66a) into main (f85d5e1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #13   +/-   ##
=======================================
  Coverage   94.36%   94.36%           
=======================================
  Files           4        4           
  Lines          71       71           
=======================================
  Hits           67       67           
  Misses          4        4           

Flag	Coverage Δ
end_to_end	94.36% <ø> (ø)

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