Remove unnecessary use of `buildx` #857

Job	Run time
Run linters with pre-commit	1m 5s
Determine Python versions	8s
Test building the documentation	1m 39s
Python 3.12 on ubuntu-22.04 (standalone: false, 32bit: false)	21m 26s
Python 3.12 on ubuntu-22.04 (standalone: false, 32bit: true)	21m 31s
Python 3.12 on ubuntu-22.04 (standalone: true, 32bit: false)	20m 57s
Python 3.12 on ubuntu-22.04 (standalone: true, 32bit: true)	21m 3s
Python 3.12 on windows-2022 (standalone: false, 32bit: false)	45m 17s
Python 3.12 on windows-2022 (standalone: false, 32bit: true)	47m 7s
Python 3.12 on windows-2022 (standalone: true, 32bit: false)	27m 40s
Python 3.12 on windows-2022 (standalone: true, 32bit: true)	27m 0s
Python 3.12 on macOS-12 (standalone: false, 32bit: false)	28m 55s
Python 3.12 on macOS-12 (standalone: false, 32bit: true)	32m 47s
Python 3.12 on macOS-12 (standalone: true, 32bit: false)	19m 39s
Python 3.12 on macOS-12 (standalone: true, 32bit: true)	23m 2s
Python 3.12 on macOS-14 (standalone: false, 32bit: false)	36m 18s
Python 3.12 on macOS-14 (standalone: false, 32bit: true)	35m 34s
Python 3.12 on macOS-14 (standalone: true, 32bit: false)	52m 46s
Python 3.12 on macOS-14 (standalone: true, 32bit: true)	42m 10s
Python 3.9 on ubuntu-22.04 (standalone: false, 32bit: false)	19m 16s
Python 3.9 on ubuntu-22.04 (standalone: true, 32bit: false)	18m 40s
Indicate completion to coveralls.io	14s
	9h 4m 14s

Provide feedback