chore: enable github action auto update in dependabot.yml

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 70.87%. Comparing base (8e75cb7) to head (64c85e3). Report is 5 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #405 +/- ## ======================================= Coverage 70.87% 70.87% ======================================= Files 28 28 Lines 412 412 Branches 87 89 +2 ======================================= Hits 292 292 Misses 119 119 Partials 1 1 ```

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