### What
Explicitly declare `@medusajs/medusa` as a devDependency for `@medusajs/medusa-js` client package.
### Why
With our latest version upgrade of `turbo`, peerDependencies aren't taken into account in the build graph. The recommendation is to also explicitly declare them in devDependencies.
### Test
* Run `yarn build --graph`
* Expect to see medusa-js having a dependency on medusa
```
"[root] @medusajs/medusa-js#build" -> "[root] @medusajs/medusa#build"
```
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