drop support for python 3.9 and 3.10 due to wombat limits

[ptrbortolotti]

Purpose

Drop python 3.9 and 3.10 as they conflict with WOMBAT, see conda-forge/wisdem-feedstock#95

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Maintenance update
• Other (please describe)

Testing

Checklist

• I have run existing tests which pass locally with my changes
• I have added new tests or examples that prove my fix is effective or that my feature works
• I have added necessary documentation

[coveralls]

Pull Request Test Coverage Report for Build 22769432950

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 79.633%

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Totals
Change from base Build 22415052811:	0.0%
Covered Lines:	27103
Relevant Lines:	34035

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💛 - Coveralls