deps: Downgrade spl crates for upcoming yank #11
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Problem
New projects using spl crates are having a hard time because of the flexible dependency on v2 or v1 of the Solana crates -- cargo picks up the highest version of the dependency if there's no lockfile, and downstream users are left with confusing error messages about multiple versions of Solana crates present in the project.
To make it easier for new projects, we are yanking SPL crates that have the flexible dependency, and spl-type-length-value 0.3.1 is one of those.
This crate is the only dependency that explicitly uses it.
Summary of Changes
Downgrade spl-token-2022 to v1 and spl-type-length-value to v0.3.0 to avoid using it.
More information at solana-labs/solana-program-library#6897