tweak(conhost): use circular_buffer instead of ImVector

- `Items` and `ItemKeys` use a circular buffer and can only store `2500` items, but ItemTimes could expand and store more.
- This would cause a crash at https://github.com/citizenfx/fivem/blob/705cd7901ac03c5a0d1e1355d94e84046309b80d/code/components/conhost-v2/src/ConsoleHostGui.cpp#L729-L734 because `ItemTimes` would have a capacity of 2500+ but `Items` and ItemKeys` would be empty

code/components/conhost-v2/src/ConsoleHostGui.cpp

@@ -684,7 +684,7 @@ auto msec()
 
 struct MiniConsole : CfxBigConsole
 {
-	ImVector<std::chrono::milliseconds> ItemTimes;
+	boost::circular_buffer<std::chrono::milliseconds> ItemTimes{ 2500 };
 
 	ConVar<std::string>* m_miniconChannels;
 	std::string m_miniconLastValue;