chore(msrv): align MSRV with rusqlite #1039

Job	Run time
Cargo test	51s
Check with minimal Rust version	47s
Cargo test (--all-features)	49s
Check	25s
Cargo test (--features alpha-async-tokio-rusqlite)	46s
Clippy (all code)	16s
Cargo test (--features from-directory)	48s
Clippy (main package)	9s
Code coverage	3m 36s
Documentation	19s
Rustfmt	7s
Mutation tests (0)	1m 14s
Mutation tests (1)	1m 13s
Mutation tests (2)	1m 8s
Mutation tests (3)	1m 8s
	13m 36s

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