add packages using pint to ecosystem.rst

[andrewgsavage]

• Closes Scientific/Engineering libraries using Pint #1216 To what extent it pint comaptible with UCUM? #1769
• 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

[codspeed-hq]

CodSpeed Performance Report

Merging #1960 will not alter performance

_{Comparing andrewgsavage:ecosystem (be714f2) with master (ad11d3a)}

Summary

✅ 437 untouched benchmarks