Yarn (1.22.17) throws warning "Workspaces can only be enabled in private projects" when installing `@swc/jest` (~0.2.21)

[benjaminblack]

Steps to reproduce:

1. mkdir test-swc && cd test-swc
2. yarn init -y
3. yarn add -D @swc/core @swc/jest

[jkbmat]

Introduced here

[npearson72]

Yep, seeing the same. Hoping more comments will get some attention.

[MasterOdin]

I've opened #153 which strips out the workspaces key/value on publishing, which I think gives the best of both worlds in terms that developing the library can utilize workspaces for the example, but consumers of the library won't be affected.