Gh-3150: Upgrade Actions versions

[GCHQDeveloper314]

Includes moving the copyright check to a dedicated job to prevent it interrupting tests.

Related issue

• Resolve #3150

[codecov[bot]]

Codecov Report

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

Comparison is base (f95ff19) 66.34% compared to head (ca5f883) 66.33%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #3151 +/- ## ============================================= - Coverage 66.34% 66.33% -0.02% + Complexity 2543 2541 -2 ============================================= Files 909 909 Lines 29026 29026 Branches 3225 3225 ============================================= - Hits 19257 19253 -4 - Misses 8333 8335 +2 - Partials 1436 1438 +2 ```

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