fix: ignore node_modules

[tom-fletcher]

Description (What)

This PR fixes #68

Justification (Why)

Monorepos with yarn and pnpm workspaces allow package locations to be defined using a glob pattern such as packages/** to allow for a deep package tree.

Syncpack uses these patterns to search for any package.json files. However, some of these packages may have their own node_modules folder and currently Syncpack will discover package.json files within these:

.
├── ...
├── packages                   
│   └── tools
│       ├── firsttool 
│       │   ├── node_modules
│       │   │    └──  some_dependency
│       │   │         ├── ...
│       │   │         └──  package.json  <--- will be picked up by Syncpack
│       │   ├── ...
│       │   └── package.json
│       ├── second tool
│       │   └── ...
│       └── ...
└── ...

This results in version mismatches due to vendor dependencies deep within the tree.

This PR adds an ignore pattern to glob, which simply excludes any node_modules folders.

[JamieMason]

Released in 6.2.1, thanks a lot @tom-fletcher