Bump docker/build-push-action from 5 to 6 #1065

Job	Run time
Determine Python versions	10s
Run linters with pre-commit	58s
Test building the documentation	1m 44s
Python 3.12 on ubuntu-22.04 (standalone: false, 32bit: false)	13m 34s
Python 3.12 on ubuntu-22.04 (standalone: false, 32bit: true)	15m 2s
Python 3.12 on ubuntu-22.04 (standalone: true, 32bit: false)	22m 24s
Python 3.12 on ubuntu-22.04 (standalone: true, 32bit: true)	21m 12s
Python 3.12 on windows-2022 (standalone: false, 32bit: false)	28m 33s
Python 3.12 on windows-2022 (standalone: false, 32bit: true)	27m 50s
Python 3.12 on windows-2022 (standalone: true, 32bit: false)	26m 50s
Python 3.12 on windows-2022 (standalone: true, 32bit: true)	27m 48s
Python 3.12 on macOS-12 (standalone: false, 32bit: false)	15m 23s
Python 3.12 on macOS-12 (standalone: false, 32bit: true)	14m 47s
Python 3.12 on macOS-12 (standalone: true, 32bit: false)	17m 20s
Python 3.12 on macOS-12 (standalone: true, 32bit: true)	18m 24s
Python 3.12 on macOS-14 (standalone: false, 32bit: false)	10m 6s
Python 3.12 on macOS-14 (standalone: false, 32bit: true)	9m 13s
Python 3.12 on macOS-14 (standalone: true, 32bit: false)	13m 58s
Python 3.12 on macOS-14 (standalone: true, 32bit: true)	12m 9s
Python 3.10 on ubuntu-22.04 (standalone: false, 32bit: false)	13m 7s
Python 3.10 on ubuntu-22.04 (standalone: true, 32bit: false)	19m 47s
Indicate completion to coveralls.io	3s
	5h 30m 22s

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