Client.fetchGuildTemplate() throws a TypeError

[WOZARDLOZARD]

Please describe the problem you are having in as much detail as possible:
When fetching a server template from the Client, the following error is thrown:
TypeError: this.client.guilds.get is not a function at GuildTemplate.get guild [as guild] (/___/___/___/___/node_modules/discord.js/src/structures/GuildTemplate.js:201:31)

I fixed this myself by changing the specified line (line 201) in the GuildTemplate.js file to this.client.guilds.cache.get(...). Minor issue but this breaks the Client.fetchGuildTemplate() function nonetheless.

Include a reproducible code sample here, if possible:

const { Client } = require('discord.js');
const client = new Client();

client.login("token");

client.fetchGuildTemplate("template code/URL").then(template => {
    // do something here
});

Further details:

• discord.js version: 12.5.0
• Node.js version: 14.5.0
• Operating system: MacOS Big Sur 11.0.1
• Priority this issue should have – please be realistic and elaborate if possible: Low, can be fixed by yourself

Relevant client options:

• partials: N/A

• gateway intents: N/A

• other: N/A

• I have also tested the issue on latest master, commit hash:

[advaith1]

cc @izexi https://github.com/discordjs/discord.js/pull/4907/files#diff-771d176d28e8d7cd4ba65413e0562da9908ee989169a6d1b1aac819ed472cc40R201