Fix compatibility with Cython 3.1 #1184

Job	Run time
Determine Python versions	8s
Run linters with pre-commit	1m 3s
Test building the documentation	1m 32s
Python 3.13 on ubuntu-22.04 (standalone: false, 32bit: false)	1h 26m 13s
Python 3.13 on ubuntu-22.04 (standalone: false, 32bit: true)	1h 29m 36s
Python 3.13 on ubuntu-22.04 (standalone: true, 32bit: false)	25m 57s
Python 3.13 on ubuntu-22.04 (standalone: true, 32bit: true)	27m 28s
Python 3.13 on windows-2022 (standalone: false, 32bit: false)	2h 10m 12s
Python 3.13 on windows-2022 (standalone: false, 32bit: true)	2h 10m 59s
Python 3.13 on windows-2022 (standalone: true, 32bit: false)	27m 14s
Python 3.13 on windows-2022 (standalone: true, 32bit: true)	27m 14s
Python 3.13 on macOS-13 (standalone: false, 32bit: false)	1h 40m 1s
Python 3.13 on macOS-13 (standalone: false, 32bit: true)	2h 2m 16s
Python 3.13 on macOS-13 (standalone: true, 32bit: false)	30m 12s
Python 3.13 on macOS-13 (standalone: true, 32bit: true)	29m 5s
Python 3.13 on macOS-14 (standalone: false, 32bit: false)	1h 25m 45s
Python 3.13 on macOS-14 (standalone: false, 32bit: true)	55m 39s
Python 3.13 on macOS-14 (standalone: true, 32bit: false)	17m 54s
Python 3.13 on macOS-14 (standalone: true, 32bit: true)	15m 46s
Python 3.10 on ubuntu-22.04 (standalone: false, 32bit: false)	1h 25m 27s
Python 3.10 on ubuntu-22.04 (standalone: true, 32bit: false)	25m 3s
Indicate completion to coveralls.io	2s
	18h 34m 46s

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