More dart dio tests, update samples #30

Job	Run time
test (ubuntu-latest, 3.9.0, samples/openapi3/client/petstore/dart-dio/oneof_polymorphism_and_inhe...	48s
test (ubuntu-latest, 3.9.0, samples/openapi3/client/petstore/dart-dio/oneof/)	46s
test (windows-latest, 3.9.0, samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake-j...	48s
test (windows-latest, 3.9.0, samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/)	50s
test (windows-latest, 3.9.0, samples/openapi3/client/petstore/dart-dio/oneof/)	49s
test (ubuntu-latest, 3.9.0, samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake-js...	47s
test (windows-latest, 3.9.0, samples/openapi3/client/petstore/dart-dio/oneof_polymorphism_and_inh...	23s
test (windows-latest, 3.9.0, samples/openapi3/client/petstore/dart-dio/petstore-timemachine/)	16s
test (windows-latest, 3.9.0, samples/openapi3/client/petstore/dart-dio/binary_response/)	49s
test (ubuntu-latest, 3.9.0, samples/openapi3/client/petstore/dart-dio/petstore-timemachine/)	52s
test (ubuntu-latest, 3.9.0, samples/openapi3/client/petstore/dart-dio/binary_response/)	48s
test (ubuntu-latest, 3.9.0, samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/)	53s
	8m 49s

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