gha: bump actions/checkout from 6 to 7 in the github-actions group (#… #61

Job	Run time
sync / sync	44s
sync / commit	30s
check / Lint translations	1m 14s
check / Build docs (latex)	9m 48s
check / Build docs (html)	9m 7s
check / Check for zero-width space characters	46s
check / Build docs (epub)	9m 2s
check / Build docs (pdf)	12m 7s
	43m 18s

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