Add divan_compat msrv check in CI

[GuillaumeLagrange]

No description provided.

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #74 will degrade performances by 12.14%

_{Comparing cod-541-add-msrv-check-in-ci (38f7270) with main (a0b46d4)}

Summary

⚡ 2 improvements
❌ 2 regressions
✅ 148 untouched benchmarks

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

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	recursive[0]	211.1 ns	240.3 ns	-12.14%
❌	recursive[5]	291.1 ns	320.3 ns	-9.11%
⚡	instant	363.6 ns	334.4 ns	+8.72%
⚡	system_time	363.6 ns	334.4 ns	+8.72%

[codspeed-hq]

CodSpeed Walltime Performance Report

Merging #74 will degrade performances by 9.93%

_{Comparing cod-541-add-msrv-check-in-ci (38f7270) with main (a0b46d4)}

Summary

⚡ 3 improvements
❌ 4 regressions
✅ 91 untouched benchmarks

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

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	recursive_memoized[BTreeMap<u64, u64>, 20]	3.5 µs	1.8 µs	+97.94%
⚡	graph_coloring[4]	3.9 µs	3.5 µs	+11.01%
❌	graph_coloring[5]	4.1 µs	4.3 µs	-3.08%
❌	graph_coloring[6]	4.6 µs	4.9 µs	-6.82%
❌	hamiltonian_cycle[6]	5.7 µs	5.9 µs	-3.44%
❌	permutations[6]	66 µs	73.2 µs	-9.93%
⚡	system_time	6.6 µs	3.5 µs	+90.38%