text: Title: loosen the docs requirements
  Body: In [docs/requirements.txt](https://github.com/cleanlab/cleanlab/blob/master/docs/requirements.txt), we have many packages pinned to only a specific version. 
  
  Goal: figure out as many of these packages where we can replace the `==` with `>=` to ensure we're running the docs build with the latest versions in our CI. 
  
  Why?  Because the docs build auto-runs all of our [tutorial notebooks](https://github.com/cleanlab/cleanlab/tree/master/docs/source/tutorials) and we'd like to automatically make sure the tutorials run with the latest versions of the dependency packages (and be aware when a dependency has released a new version that breaks things). 
  
  If working on this, you can feel free to only focus on a specific dependency and test the docs build if you replace `==` with `>=` for that one dependency. 