Fix typo in "celcius"

[julienduquesne]

The right spelling is "celsius"

• [ ] If this PR is a bug fix, the bug is documented in the test suite.
• [ ] Changes were documented in the changelog (pending section).
• [ ] If necessary, changes were made to the documentation (eg new pipeline).

[codecov[bot]]

Codecov Report

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

Comparison is base (bd0c388) 96.70% compared to head (93411f8) 96.70%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #247 +/- ## ======================================= Coverage 96.70% 96.70% ======================================= Files 255 255 Lines 8372 8372 ======================================= Hits 8096 8096 Misses 276 276 ```

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