perf: remove unneeded async from arithmetic eval

[reubeno]

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Test Results

    2 files      9 suites   1m 20s ⏱️
  574 tests   574 ✅ 0 💤 0 ❌
1 134 runs  1 134 ✅ 0 💤 0 ❌

Results for commit c024ebf.

♻️ This comment has been updated with latest results.

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Performance Benchmark Report

Benchmark name	Baseline (μs)	Test/PR (μs)	Delta (μs)	Delta %
clone_shell_object	19.53 μs	19.54 μs	0.01 μs	⚪ Unchanged
eval_arithmetic	0.44 μs	0.21 μs	-0.22 μs	🟢 -50.80%
expand_one_string	2.38 μs	2.29 μs	-0.10 μs	⚪ Unchanged
for_loop	62.84 μs	64.80 μs	1.96 μs	⚪ Unchanged
function_call	5.06 μs	5.12 μs	0.05 μs	⚪ Unchanged
instantiate_shell	61.77 μs	64.86 μs	3.10 μs	🟠 +5.02%
instantiate_shell_with_init_scripts	29781.40 μs	28995.67 μs	-785.73 μs	🟢 -2.64%
parse_bash_completion	2868.26 μs	2846.95 μs	-21.31 μs	⚪ Unchanged
parse_sample_script	4.36 μs	4.36 μs	-0.00 μs	⚪ Unchanged
run_echo_builtin_command	22.25 μs	22.21 μs	-0.04 μs	⚪ Unchanged
run_one_external_command	1840.91 μs	1579.97 μs	-260.94 μs	🟢 -14.17%

Code Coverage Report: Only Changed Files listed

Package	Base Coverage	New Coverage	Difference
brush-core/src/arithmetic.rs	🟢 98.45%	🟢 98.4%	🔴 -0.05%
brush-core/src/jobs.rs	🔴 37.07%	🔴 43.1%	🟢 6.03%
brush-core/src/shell.rs	🟢 82.29%	🟢 82.4%	🟢 0.11%
Overall Coverage	🟢 76.6%	🟢 76.68%	🟢 0.08%

Minimum allowed coverage is 70%, this run produced 76.68%