revert: chore: Remove lock of cargo-insta

[max-sixty]

Reverts #1169 until I can resolve why the arg passing doesn't seem to be working:

❯ cargo insta test -- --target=wasm32-unknown-unknown
    Finished test [unoptimized + debuginfo] target(s) in 0.16s
     Running unittests src/main.rs (target/debug/deps/mdbook_prql-1b98900596ae00f7)
error: Unrecognized option: 'target'
     Running tests/snapshot.rs (target/debug/deps/snapshot-610ac3b37a4750ff)
error: Unrecognized option: 'target'
     Running unittests src/lib.rs (target/debug/deps/prql_compiler-bb28a9cd9d5e2c10)
error: Unrecognized option: 'target'
     Running unittests src/main.rs (target/debug/deps/prql_compiler-49d0107c77853836)
error: Unrecognized option: 'target'
     Running tests/integration/main.rs (target/debug/deps/integration-25b5c22e67643858)
error: Unrecognized option: 'target'
     Running unittests src/lib.rs (target/debug/deps/prql_python-f72459eddfcb7416)
error: Unrecognized option: 'target'