chore(deps-rs): update thiserror requirement from 1.0.28 to 2.0.6 #2839

Job	Run time
Check for changes	6s
check	1m 49s
Build benchmarks 🏋️	3m 12s
tests (Rust stable, all features)	3m 15s
tests (Rust stable, no features)	2m 18s
tests (Rust nightly, coverage)	5m 17s
tests (Rust 1.75)	3m 49s
tests hugr-llvm	0s
tests (Rust beta)	3m 26s
Check standard extensions	4s
Required checks 🦀	1s
	23m 17s

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