Fix PDF build for Python 3.14 #452

Job	Run time
sync / sync	34s
check / Build docs (latex)	8m 56s
check / Check for zero-width space characters	8s
check / Build docs (html)	8m 48s
check / Build docs (epub)	8m 16s
check / Lint translations	38s
check / Build docs (pdf)	0s
	27m 20s

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