Exempt `raise NotImplementedError` from coverage

[lunkwill42]

We just don't need it.

[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   51s :stopwatch: 320 tests 320 :white_check_mark: 0 :zzz: 0 :x: 960 runs  958 :white_check_mark: 2 :zzz: 0 :x:

Results for commit db2a9c9b.

[codecov[bot]]

Codecov Report

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

Project coverage is 98.98%. Comparing base (ee3412f) to head (db2a9c9).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #237 +/- ## ======================================= Coverage 98.98% 98.98% ======================================= Files 50 50 Lines 6566 6566 ======================================= Hits 6499 6499 Misses 67 67 ```

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[lunkwill42]

... and I don't think we need a towncrier file for this