DEV: pyparsing<3.0.0

[rrjbca]

Description

matplotlib 3.4.3 is incompatible with the recent pyparsing 3.x releases. Fix the version of pyparsing used to pyparsing<3.0.0 until the dependency conflict is resolved. Resolves #499

Checklist

• [x] Follow the Contributor Guidelines
• [ ] Write unit tests
• [ ] Write documentation strings
• [x] Assign someone from your working team to review this pull request
• [x] Assign someone from the infrastructure team to review this pull request