fix: Handle rustflags from .cargo/config.toml #109

Performance Regression: -15.89%

⚡ 10 improvements
❌ 3 regressions
✅ 154 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

	Benchmark	`BASE`	`HEAD`	Change
❌	`bench_array1[4]`	154.4 ns	183.6 ns	-15.89%
❌	`bench_array2[4]`	154.4 ns	183.6 ns	-15.89%
❌	`init_array[4]`	154.4 ns	183.6 ns	-15.89%
⚡	`mut_borrow`	924.2 ns	895 ns	+3.26%
⚡	`recursive[0]`	240.3 ns	211.1 ns	+13.82%
⚡	`recursive[5]`	320.3 ns	291.1 ns	+10.02%
⚡	`instant`	363.6 ns	334.4 ns	+8.72%
⚡	`system_time`	363.6 ns	334.4 ns	+8.72%
⚡	`sleep_100ns`	566.1 ns	536.9 ns	+5.43%
⚡	`sleep_100us`	566.1 ns	536.9 ns	+5.43%
⚡	`sleep_1ms`	566.1 ns	536.9 ns	+5.43%
⚡	`sleep_1ns`	566.1 ns	536.9 ns	+5.43%
⚡	`sleep_1us`	566.1 ns	536.9 ns	+5.43%