Pinning pandas version for aws postprocessing

[nmerket]

Pull Request Description

Pandas 1.0.4 is broken. I fixed it for Eagle in #161. I fixed it in the setup.py in #160. This adds that fix to the dask bootstrap script as well so it works on AWS.

Checklist

Not all may apply

• Code changes (must work)
• Tests exercising your feature/bug fix (check coverage report on CircleCI build -> Artifacts)
• All other unit tests passing
• Update validation for project config yaml file changes
• Update existing documentation
• Run a small batch run to make sure it all works (local is fine, unless an Eagle specific feature)
• Add to the changelog_dev.rst file and propose migration text in the pull request

[nmerket]

cc @adamsten