Keep GitHub actions updated with Dependabot

[johannaengland]

It would be good to not manually have to keep on top of all action updates.

Reference: https://docs.github.com/en/code-security/dependabot/working-with-dependabot/keeping-your-actions-up-to-date-with-dependabot

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[github-actions[bot]]

Test results

    3 files      3 suites   48s :stopwatch: 315 tests 315 :heavy_check_mark: 0 :zzz: 0 :x: 945 runs  943 :heavy_check_mark: 2 :zzz: 0 :x:

Results for commit ec3e9a31.

[codecov[bot]]

Codecov Report

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

Project coverage is 98.97%. Comparing base (5805c67) to head (ec3e9a3).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #221 +/- ## ======================================= Coverage 98.97% 98.97% ======================================= Files 47 47 Lines 6532 6532 ======================================= Hits 6465 6465 Misses 67 67 ```

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