Changes the vote sound to announce_dig (#3615)

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## About The Pull Request

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Changes the vote sound to announce_dig.ogg


## Why It's Good For The Game

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benefit the game. If you can't justify it in words, it might not be
worth adding. -->

The current vote sound is easy to miss, and I think this one might be
better as it's a longer and louder tone.
## Changelog

:cl:
add: Vote sound changed to announce_dig.ogg
/:cl:

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code/datums/votes/_vote_datum.dm

@@ -10,7 +10,7 @@
 	/// If supplied, an override question will be displayed instead of the name of the vote.
 	var/override_question
 	/// The sound effect played to everyone when this vote is initiated.
-	var/vote_sound = 'sound/misc/compiler-stage2.ogg'
+	var/vote_sound = 'sound/misc/announce_dig.ogg'
 	/// A list of default choices we have for this vote.
 	var/list/default_choices
 	/// What message do we want to pass to the player-side vote panel as a tooltip?