Voice regions modifications errors

[JumperBoost]

General Troubleshooting

• I have checked for similar issues.
• I have updated to the latest JDA version.
• I have checked the branches or the maintainers' PRs for upcoming bug fixes.

Bug Report

When we changed the region of a voice channel (rtc_region), an error appears.
It's appears only with EUROPE (not exists from discord) and HONG_KONG (not in VOICE_CHANNEL_REGIONS list [from Region.java]).

Expected Behavior

Should be able to change voice channel's region with Europe (Rotterdam instead currently) and Hong-Kong.

Exception or Error + Code Example or Reproduction Steps

Europe:

Code: JDA.getVoiceChannelById("ID").getManager().setRegion(Region.EUROPE).queue();

Hong-Kong:

Code: JDA.getVoiceChannelById("ID").getManager().setRegion(Region.HONG_KONG).queue();

To fix that, i think we should add Rotterdam, replace Europe by Rotterdam (apparently the only European discord server) & add HONG_KONG from VOICE_CHANNEL_REGIONS in Region.java.

[MinnDevelopment]

I was told there might be a new EU region in milan soon

[JumperBoost]

You're right, I was able to find a server in Milan, but it would be nice to have Milan and Rotterdam, since I have more ping in Milan. It's not possible to select Milan actualy but soon i think.

Milan:

Rotterdam: