perf(es/minifier): Adjust threshold for parallel char frequency calculation #26486

Job	Run time
List crates to benchmark	27s
Build benchmark for swc	25m 43s
Build benchmark for swc_allocator	1m 35s
Build benchmark for swc_common	1m 13s
Build benchmark for swc_css_parser	3m 56s
Build benchmark for swc_ecma_codegen	4m 17s
Build benchmark for swc_ecma_lints	2m 50s
Build benchmark for swc_ecma_minifier	4m 31s
Build benchmark for swc_ecma_parser	4m 31s
Build benchmark for swc_ecma_preset_env	4m 53s
Build benchmark for swc_ecma_transforms_base	4m 29s
Build benchmark for swc_ecma_transforms_typescript	4m 31s
Build benchmark for swc_estree_compat	4m 34s
Build benchmark for swc_fast_ts_strip	3m 33s
Build benchmark for swc_html_minifier	5m 38s
Build benchmark for swc_html_parser	3m 43s
Run benchmarks	30m 43s
	1h 51m 7s

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