[FIX] Add override annotation on MaterialColor generation

[codecov[bot]]

Codecov Report

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

Comparison is base (b20e952) 98.46% compared to head (5f25b67) 98.46%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #13 +/- ## ======================================= Coverage 98.46% 98.46% ======================================= Files 31 31 Lines 847 847 ======================================= Hits 834 834 Misses 13 13 ```

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[stongef-sonepar]

This should be ready to merge.