[pyproject] Fix pyproject syntax

[jjmerchante]

This commit fixes the 'include' list. It was a mix of dictionaries and strings.

[coveralls]

Pull Request Test Coverage Report for Build 3327018480

• 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 82.698%

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Totals
Change from base Build 3321549643:	0.0%
Covered Lines:	9024
Relevant Lines:	10912

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 3327018480

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.3%) to 82.424%

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Totals
Change from base Build 3321549643:	-0.3%
Covered Lines:	8849
Relevant Lines:	10736

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💛 - Coveralls