Bump upload/download artifact and configure dependabot to group them

[DominicOram]

It's required to bump both dependencies at the same time.

To test:

• Confirm CI is passing and that we have artifacts for each job

[codecov[bot]]

Codecov Report

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

Comparison is base (6f588b9) 100.00% compared to head (c62a63f) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #161 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 2 2 Lines 16 16 ========================================= Hits 16 16 ```

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