Update macOS target to macOS 11 and remove python 3.7

[emlowe]

Changed MACOSX_DEPLOYMENT_TARGET to macOS 11 Remove python 3.7

[coveralls-official[bot]]

Pull Request Test Coverage Report for Build 5803062744

• 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 94.649%

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Totals
Change from base Build 5803037078:	0.0%
Covered Lines:	1645
Relevant Lines:	1738

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💛 - Coveralls

[emlowe]

close and reopen for CI