Drop python 3.8 support python 3.13 in python generator #402

Job	Run time
Test Python client (3.9, samples/openapi3/client/petstore/python-aiohttp)	45s
Test Python client (3.10, samples/openapi3/client/petstore/python-aiohttp)	49s
Test Python client (3.12, samples/openapi3/client/petstore/python-aiohttp)	46s
Test Python client (3.9, samples/openapi3/client/petstore/python)	42s
Test Python client (3.13, samples/openapi3/client/petstore/python-aiohttp)	50s
Test Python client (3.11, samples/openapi3/client/petstore/python)	49s
Test Python client (3.11, samples/openapi3/client/petstore/python-aiohttp)	44s
Test Python client (3.12, samples/openapi3/client/petstore/python)	41s
Test Python client (3.13, samples/openapi3/client/petstore/python)	48s
Test Python client (3.10, samples/openapi3/client/petstore/python)	55s
Test Python client (3.12, samples/openapi3/client/petstore/python)	41s
Test Python client (3.11, samples/openapi3/client/petstore/python-aiohttp)	44s
Test Python client (3.9, samples/openapi3/client/petstore/python)	1m 8s
Test Python client (3.10, samples/openapi3/client/petstore/python)	55s
Test Python client (3.13, samples/openapi3/client/petstore/python)	48s
Test Python client (3.9, samples/openapi3/client/petstore/python-aiohttp)	45s
Test Python client (3.11, samples/openapi3/client/petstore/python)	49s
Test Python client (3.13, samples/openapi3/client/petstore/python-aiohttp)	50s
Test Python client (3.10, samples/openapi3/client/petstore/python-aiohttp)	49s
Test Python client (3.12, samples/openapi3/client/petstore/python-aiohttp)	46s
	16m 4s

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