Fixes #1950 TypeError temperature to base units

[biagiodistefano]

• Closes TypeError when calling to_base_units() for temperature. #1950
• Executed pre-commit run --all-files with no errors
• The change is fully covered by automated unit tests
• Documented in docs/ as appropriate
• Added an entry to the CHANGES file

[hgrecco]

I don't think this is correct. Pint respects Python rules. If you defined a float registry, you need to use floats. If you want to use decimal in your quantities, define a Decimal registyr.