`schemer-rusqlite`: update doc example; exposes error#21

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nathan-at-least wants to merge 1 commit intoaschampion:mainfrom

nathan-at-least:fix-schemer-rusqlite-doc-tests

Commits on Aug 19, 2023

schemer-rusqlite: Ensure doc example is tested by `cargo test`; update to modern rust; unwrapping `Result` shows `no such table: _schemer` error.
Nate Wilcox
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