epubcheck: update URLs

Closes #35163.

Signed-off-by: Tim D. Smith <git@tim-smith.us>
libbpg 0.9.4

Closes #35162.

Signed-off-by: Tim D. Smith <git@tim-smith.us>
libbpg: update 0.9.4 bottle.
pandoc 1.13.2

Closes #35160.

Signed-off-by: Tim D. Smith <git@tim-smith.us>
pandoc: update 1.13.2 bottle.
apache-spark 1.2.0

Closes #35158.

Signed-off-by: Tim D. Smith <git@tim-smith.us>
Merge remote-tracking branch 'upstream/master'