Drop the `devDependencies` check when publishing on PureScript `0.15.2` or greater

[JordanMartinez]

With https://github.com/purescript/purescript/pull/4332 merged, we can now drop the requirement here as well. That should fix the following issues:

• a dependency that appears once in dependencies and devDependencies causes the publish to fail
• Pursuit no longer lists dev deps as dependencies of a library