chore(deps-rs): update smol_str requirement from 0.2.0 to 0.3.1 in the minor group #2107

Job	Run time
Check for changes in Rust files	3s
check	1m 26s
Build benchmarks 🏋️	6m 18s
tests (Rust stable, no features)	1m 58s
tests (Rust nightly, coverage)	2m 42s
tests (Rust stable, all features)	2m 31s
tests (Rust 1.75)	2m 26s
tests (Rust beta)	2m 34s
Check standard extensions	4s
Required checks 🦀	1s
	20m 3s

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