Add security analysis with zizmor #928

Job	Run time
sync / sync	54s
sync / commit	25s
check / Lint translations	1m 1s
check / Check for zero-width space characters	43s
check / Build docs (html)	7m 46s
check / Build docs (latex)	7m 44s
check / Build docs (epub)	7m 50s
check / Build docs (pdf)	10m 18s
	36m 41s

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