[Doppins] Upgrade dependency discord.js to 11.5.1

[doppins-bot]

Hi!

A new version was just released of discord.js, so Doppins
has upgraded your project's dependency ranges.

Make sure that it doesn't break anything, and happy merging!

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Upgraded discord.js from 11.4.2 to 11.5.0

[coveralls]

Coverage remained the same at 97.207% when pulling 8d18b65 on doppins/discord.js-equals-11.5.0 into d528aed on master.

[doppins-bot]

An additional new version was just released of discord.js, so we've added an
extra commit upgrading your range to 11.5.1.

Hope that's alright!
— Doppins

[Throne3d]

@ekmartin What's the current policy on dependency upgrades? I've currently been leaving them to you, and it looks like you close any that update the major version, but I wanted to confirm this so I could help out with either merging them or rejecting them.

If that is the criterion, will we be doing major upgrades at some point? We don't currently need the newer features (that I know of), but we may miss out on some useful changes by staying on older major versions, so I wanted to know if there was a longer-term plan around them.

[Throne3d]

Oh, looks like I just missed some of our individual dependency upgrades, because they were collated into different commits. I'll have a look through the rest of these.

[Throne3d]

None of the deprecations appear to hit us, and it adds some fixes (though those probably also – mostly – won't affect us, just perhaps the Util.splitMessage one or WebhookClient's failed rate limiting): https://github.com/discordjs/discord.js/releases/tag/11.5.0, https://github.com/discordjs/discord.js/releases/tag/11.5.1. Looks fine to merge.