chore: bump to rust 1.91 #6507

Performance Regression: -37.24%

⚡ 34 improved benchmarks
❌ 27 regressed benchmarks
✅ 1074 untouched benchmarks
⏩ 1268 skipped benchmarks¹

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

	Mode	Benchmark	`BASE`	`HEAD`	Efficiency
⚡	Simulation	`take_fsl_nullable_random[1024, 1000]`	22.6 ms	18.4 ms	+22.69%
⚡	Simulation	`take_fsl_nullable_random[256, 1000]`	4.7 ms	3.8 ms	+25.52%
❌	Simulation	`encode_varbinview[(1000, 2)]`	255.6 µs	293.4 µs	-12.86%
⚡	Simulation	`take_fsl_nullable_random[1024, 100]`	2 ms	1.6 ms	+28.78%
⚡	Simulation	`take_fsl_nullable_random[4096, 100]`	8.1 ms	6.3 ms	+29.19%
⚡	Simulation	`take_fsl_nullable_random[256, 100]`	546.6 µs	443.6 µs	+23.22%
⚡	Simulation	`take_fsl_nullable_random[4096, 1000]`	90.8 ms	73.7 ms	+23.12%
⚡	Simulation	`take_fsl_nullable_random[64, 1000]`	1.3 ms	1.1 ms	+14.63%
⚡	Simulation	`take_fsl_random[1024, 100]`	2 ms	1.5 ms	+30.83%
❌	Simulation	`bench_many_codes_few_values[1024]`	295.2 µs	338.3 µs	-12.73%
⚡	Simulation	`take_fsl_random[1024, 1000]`	23 ms	18.3 ms	+25.83%
⚡	Simulation	`take_fsl_random[256, 1000]`	4.9 ms	3.8 ms	+28.37%
⚡	Simulation	`bench_sparse_coverage[0.01]`	338 µs	295.8 µs	+14.26%
⚡	Simulation	`take_fsl_random[256, 100]`	530.6 µs	422.6 µs	+25.55%
⚡	Simulation	`take_fsl_random[4096, 1000]`	92.7 ms	73.4 ms	+26.27%
⚡	Simulation	`take_fsl_random[64, 100]`	162.7 µs	145.7 µs	+11.66%
⚡	Simulation	`take_fsl_random[4096, 100]`	8.2 ms	6.3 ms	+30.74%
⚡	Simulation	`take_fsl_random[64, 1000]`	1.3 ms	1.1 ms	+16.29%
❌	Simulation	`take_struct_simple`	6.9 µs	8.3 µs	-16.46%
⚡	Simulation	`old_raw_prim_test_between[i32, 32768]`	390.5 µs	347.4 µs	+12.42%
...	...	...	...	...	...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.

_{Comparing ji/bump-rust-1.91 (31ca44b) with develop (0d1a769)}

1268 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩