Really any imperative language or even functional language that has network capabilities.
You only need to send a simple HTTP request to upvote something just like your browser does when you click an upvote button.
All* programming languages have some networking capabilities, even if it's horrible 'out of the box' (C/C++). Raw speed of the language will probably be irrelevant considering the overhead of sending network requests anyway. Use whatever's easiest and most convenient.
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