add pypy-3.11-nightly runs #299

Job	Run time
Cython pypy-3.10-nightly ubuntu	1h 0m 13s
Cython pypy-3.10-nightly ubuntu -DCYTHON_USE_TYPE_SPECS=1	1h 0m 13s
Cython pypy-3.11-nightly ubuntu	34s
Cython pypy-3.11-nightly ubuntu -DCYTHON_USE_TYPE_SPECS=1	31s
Cython pypy-3.10-nightly windows	1h 0m 12s
Cython pypy-3.10-nightly windows -DCYTHON_USE_TYPE_SPECS=1	1h 0m 11s
Cython pypy-3.11-nightly windows	44s
Cython pypy-3.11-nightly windows -DCYTHON_USE_TYPE_SPECS=1	44s
Cython pypy-3.10-nightly macOS	1h 0m 15s
Cython pypy-3.10-nightly macOS -DCYTHON_USE_TYPE_SPECS=1	1h 0m 14s
Cython pypy-3.11-nightly macOS	27s
Cython pypy-3.11-nightly macOS -DCYTHON_USE_TYPE_SPECS=1	26s
	6h 4m 44s

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