Fix number parsing to accept underscore after decimal point

[jeparlefrancais]

Closes #105

• [x] add entry to the changelog

[github-actions[bot]]

Coverage after merging fix-number-underscore-after-decimal-point into main will be

89.36%

Coverage Report for Changed Files

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src/nodes/expressions
number.rs	91.68%	100%	87.74%	92.59%	275–279, 281, 291–295, 297–298, 379–387, 389, 442