Bumping numpy version for Mac M1 compat

[rsmith49]

Description of proposed changes

According to https://github.com/snorkel-team/snorkel/issues/1689, numpy versions lower than 1.21 are not supported by the new Mac M1 chips. Bumping the upper bound of numpy to accommodate this.

Related issue(s)

Fixes https://github.com/snorkel-team/snorkel/issues/1689

Test plan

Checklist

Need help on these? Just ask!

• [x] I have read the CONTRIBUTING document.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] I have run tox -e complex and/or tox -e spark if appropriate.
• [] All new and existing tests passed.

[bhancock8]

Let's rebase now that #1696 is merged, then note on #1695 that this is now resolved.

[zexuan-zhou]

@rsmith49 I think merging this PR will help py37 and py38 CI builds

[rsmith49]

@zexuan-zhou thanks for all the dev effort here! Looks like we addressed the mypy issues - ready for a review @bhancock8

[zexuan-zhou]

@bhancock8 @rsmith49 Will there be a version release for this or what version should I use to install the latest version. Thank you