Update to support rusqlite 0.32

[nuttycom]

I've been wondering: would it make sense to create a release for each semver-incompatible rusqlite version? That way it's at least possible for users of the crate to get one that works with their stack.

@aschampion If it would be helpful I would like to offer to become a co-maintainer of the schemer and schemer-rusqlite crates on crates.io; I use these crates extensively both for work and personal projects, and would like to be able to make sure they work for as many users as possible.

[str4d]

CI failure is due to MSRV incompatibility.

rusqlite 0.29 depends on hashlink 0.8; rusqlite 0.31 migrated to hashlink 0.9.

hashlink 0.8.2 migrated from hashbrown 0.12 (MSRV 1.56) to hashbrown 0.13 (MSRV 1.61). hashlink 0.8.3 migrated again to hashbrown 0.14 (MSRV 1.63). That dependency is maintained in hashlink 0.9.

Ergo, if we only migrated to rusqlite 0.30 then current MSRV of 1.59 could be maintained (as there exists a compatible hashlink version). Latest rusqlite unfortunately has a required MSRV of 1.63.

[str4d]

The necessary sequence of MSRV bumps (and associated dependency versions) can be found here: zcash/schemerz#4

[nuttycom]

Closing; using zcash/schemerz instead.