benchsuite: update subtitle URLs
benchsuite: update subtitle URLs

Since the English subtitle file actually changed its content, we tweak
the benchmark to use a slightly bigger sample that more closely matches
the file size of the Russian subtitle file.

Also, the BurntSushi/linux repo has been updated and I've confirmed that
it builds on my Linux machine.

Fixes #1257

BurntSushi/ripgrep,BurntSushi/ripgrep,BurntSushi/ripgrep,BurntSushi/ripgrep