replace some constants with ones from pint

[ngam]

fix #251

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 5.15%.

Quality metrics	Before	After	Change
Complexity	0.00 ⭐	0.00 ⭐	0.00
Method Length	54.00 ⭐	50.00 ⭐	-4.00 👍
Working memory	7.20 🙂	5.47 ⭐	-1.73 👍
Quality	77.27% ⭐	82.42% ⭐	5.15% 👍

Other metrics	Before	After	Change
Lines	69	70	1

Changed files	Quality Before	Quality After	Quality Change
particula/init.py	99.67% ⭐	99.67% ⭐	0.00%
particula/constants.py	73.82% 🙂	79.77% ⭐	5.95% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation

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