chore: remove requirement for specific package manager version

[kempsterrrr]

We seem to be working on separate versions of pnpm, I suggest we remove the specific requirement by adding the following to .npmrc file to make dev easier. I find myself switching the pnpm version on every PR/branch review etc. and I'm unsure if there is a clean way to manage pnpmv versions like with npmrc for node

package-manager-strict=false