perf(es/lexer): Do not scan number if no underscore

[bvanjoi]

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Latest commit: b05fc99

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[codspeed-hq]

CodSpeed Performance Report

Merging #10788 will improve performances by 2.1%

_{Comparing bvanjoi:parse-pref (b05fc99) with dev/parser (0ecb3f5)}

Summary

⚡ 1 improvements
✅ 140 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	es/preset-env/entry/import	28.4 µs	27.8 µs	+2.1%