Checking for bibentries cited but not shown needs the package sources. #9618

Job	Run time
MacOS (macOS-15-intel)	1h 0m 14s
Windows (check, arm)	53m 44s
MacOS (macOS-15)	23m 21s
Windows (installer, arm)	23m 55s
Windows (installer, intel)	22m 56s
Windows (check, intel)	54m 0s
Linux (clang, debian:stable, intel)	34m 24s
Linux (clang, debian:stable, arm)	33m 54s
Linux (gcc, debian:testing, arm)	32m 2s
Linux (gcc, debian:stable, intel)	34m 3s
Linux (gcc, debian:testing, intel)	32m 9s
Linux (clang, debian:testing, arm)	31m 53s
Linux (clang, debian:testing, intel)	34m 28s
Linux (gcc, debian:stable, arm)	31m 59s
	8h 23m 2s

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