Update cuviper's contact info and drop WG-security-response's discord-roles

[cuviper]

I don't really use Discord anymore, nor IRC at all, but you can find me on Matrix in case Zulip isn't working for some reason.

Also drop WG-security-response's discord-roles since the official discord has been retired.

team/teams/wg-security-response.toml

Lines 31 to 33 in aaf9562

	[[discord-roles]]
	name = "security"
	color = "#e91e63"

[jieyouxu]

I did not know WG-security-response had a discord-id requirement, huh

[ERROR rust_team::validate] validation error: the following members of the "wg-security-response" team do not have discord_ids: cuviper

[jieyouxu]

Oh, maybe you also need to sunset

team/teams/wg-security-response.toml

Lines 31 to 33 in aaf9562

	[[discord-roles]]
	name = "security"
	color = "#e91e63"

?

[cuviper]

I think perhaps all discord-roles should go away, but for this one in particular:
@pietroalbini @Manishearth should we drop our role there?

[jieyouxu]

Since we sunset the "official" discord already IIRC

[pietroalbini]

The discord server is being retired, we should just remove any automation around it.

[Manishearth]

Yeah, I think it makes sense to drop this

[cuviper]

OK, for the moment I've only removed it from wg-security-response.

[weihanglo]

The schema supports matrix?

[cuviper]

Yes, according to https://github.com/rust-lang/team/blob/master/docs/toml-schema.md#people

[github-actions]

Dry-run check results

[WARN  sync_team] sync-team is running in dry mode, no changes will be applied.
[INFO  sync_team] synchronizing github