Rename GMPv228 to GMPNext and packages accordingly #400

Job	Run time
Check type hints (3.13)	29s
Check type hints (3.12)	28s
Check type hints (3.9)	31s
Build the documentation	42s
Check type hints (3.10)	34s
Check type hints (3.11)	28s
Check versioning / Check versioning for consistency	14s
Run tests (3.10) / Run all tests	33s
Run tests (3.12) / Run all tests	32s
Run tests (3.13) / Run all tests	31s
Run tests (3.9) / Run all tests	41s
Linting (3.12) / Linting	29s
Linting (3.9) / Linting	26s
Linting (3.13) / Linting	26s
Linting (3.10) / Linting	27s
Run tests (3.11) / Run all tests	29s
Linting (3.11) / Linting	26s
Upload coverage to codecov.io	38s
	9m 4s

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