chore: update deny config to allow-list unmaintained test crate

[reubeno]

No description provided.

[github-actions]

Test Results

    5 files     40 suites   15m 7s ⏱️
2 488 tests 2 488 ✅ 0 💤 0 ❌
7 733 runs  7 733 ✅ 0 💤 0 ❌

Results for commit bb292b8.

[github-actions]

Performance Benchmark Report

Benchmark name	Baseline (μs)	Test/PR (μs)	Delta (μs)	Delta %
clone_shell_object	17.52 μs	17.47 μs	-0.05 μs	⚪ Unchanged
eval_arithmetic	0.15 μs	0.15 μs	0.00 μs	⚪ Unchanged
expand_one_string	1.63 μs	1.67 μs	0.04 μs	⚪ Unchanged
for_loop	31.03 μs	31.39 μs	0.36 μs	⚪ Unchanged
full_peg_complex	56.05 μs	56.16 μs	0.11 μs	⚪ Unchanged
full_peg_for_loop	6.21 μs	6.24 μs	0.03 μs	⚪ Unchanged
full_peg_nested_expansions	16.55 μs	16.61 μs	0.05 μs	⚪ Unchanged
full_peg_pipeline	4.17 μs	4.26 μs	0.09 μs	🟠 +2.08%
full_peg_simple	1.74 μs	1.76 μs	0.02 μs	⚪ Unchanged
function_call	3.44 μs	3.44 μs	0.00 μs	⚪ Unchanged
instantiate_shell	55.03 μs	55.85 μs	0.82 μs	⚪ Unchanged
instantiate_shell_with_init_scripts	27401.45 μs	27622.95 μs	221.50 μs	⚪ Unchanged
parse_peg_bash_completion	2080.53 μs	2094.69 μs	14.16 μs	⚪ Unchanged
parse_peg_complex	18.74 μs	18.75 μs	0.01 μs	⚪ Unchanged
parse_peg_for_loop	1.84 μs	1.87 μs	0.03 μs	🟠 +1.58%
parse_peg_pipeline	2.03 μs	1.92 μs	-0.11 μs	⚪ Unchanged
parse_peg_simple	1.02 μs	1.04 μs	0.01 μs	⚪ Unchanged
run_echo_builtin_command	15.63 μs	15.51 μs	-0.12 μs	⚪ Unchanged
tokenize_sample_script	3.52 μs	3.56 μs	0.04 μs	⚪ Unchanged

Code Coverage Report: Only Changed Files listed

Package	Base Coverage	New Coverage	Difference
brush-core\src\openfiles.rs	🔴 10.5%	🔴 10.94%	🟢 0.44%
brush-core\src\shell\fs.rs	🔴 13.04%	🔴 12.1%	🔴 -0.94%
Overall Coverage	🟢 25.82%	🟢 25.83%	🟢 0.01%

Minimum allowed coverage is 20%, this run produced 25.83%
Maximum allowed coverage difference is -5%, this run produced 0.01%

Test Summary: bash-completion test suite

Outcome	Count	Percentage
✅ Pass	1582	75.01
❗️ Error	18	0.85
❌ Fail	155	7.35
⏩ Skip	339	16.07
❎ Expected Fail	13	0.62
✔️ Unexpected Pass	2	0.09
📊 Total	2109	100.00

[Copilot]

Pull request overview

Updates the workspace cargo-deny configuration to silence a new RustSec advisory for a test-only dependency, keeping advisory checks actionable while upstream work to replace the crate is pending.

Changes:

• Replaces the ignored RustSec advisory entry in deny.toml with RUSTSEC-2026-0173 for proc-macro-error2.
• Documents that the ignored advisory is for a test-only dependency chain (test-with) and is intended to be temporary.