chore(deps): update dependency discord.net to v3.15.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Discord.Net	3.15.2 -> 3.15.3

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Release Notes

discord-net/Discord.Net (Discord.Net)

### [`v3.15.3`](https://togithub.com/discord-net/Discord.Net/blob/HEAD/CHANGELOG.md#3153---2024-07-21) [Compare Source](https://togithub.com/discord-net/Discord.Net/compare/3.15.2...3.15.3) ##### Added - [#​2963](https://togithub.com/discord-net/Discord.Net/issues/2963) Application Emojis ([`26bb789`](https://togithub.com/discord-net/Discord.Net/commit/26bb789)) - \[EXPERIMENTAL] [#​2931](https://togithub.com/discord-net/Discord.Net/issues/2931) Member search v2 ([`e18915a`](https://togithub.com/discord-net/Discord.Net/commit/e18915a)) - [#​2952](https://togithub.com/discord-net/Discord.Net/issues/2952) add `IsAvailable` to `GuildEmote` ([`cb79f04`](https://togithub.com/discord-net/Discord.Net/commit/cb79f04)) - [#​2965](https://togithub.com/discord-net/Discord.Net/issues/2965) Add team member `Role` property ([`6e531a2`](https://togithub.com/discord-net/Discord.Net/commit/6e531a2)) ##### Fixed - [#​2958](https://togithub.com/discord-net/Discord.Net/issues/2958) crash when poll is null in RestMessageComponent ([`24c7605`](https://togithub.com/discord-net/Discord.Net/commit/24c7605)) - [#​2962](https://togithub.com/discord-net/Discord.Net/issues/2962) incomplete validation when ChannelFlags.RequireTag is true ([`f5fdfb2`](https://togithub.com/discord-net/Discord.Net/commit/f5fdfb2)) - [#​2948](https://togithub.com/discord-net/Discord.Net/issues/2948) Fix IndexOf bug in CreateBucketId ([`ec0ba49`](https://togithub.com/discord-net/Discord.Net/commit/ec0ba49)) - [#​2959](https://togithub.com/discord-net/Discord.Net/issues/2959) Fix automod related events in the sharded client ([`8b6be64`](https://togithub.com/discord-net/Discord.Net/commit/8b6be64)) - [#​2966](https://togithub.com/discord-net/Discord.Net/issues/2966) Fix `CustomSticker.DeleteAsync()` ([`359f6db`](https://togithub.com/discord-net/Discord.Net/commit/359f6db)) ##### Misc - [#​2951](https://togithub.com/discord-net/Discord.Net/issues/2951) Update for the breaking change discord has made + v3 is cringe ([`8afea2c`](https://togithub.com/discord-net/Discord.Net/commit/8afea2c)) - [#​2953](https://togithub.com/discord-net/Discord.Net/issues/2953) longer polls ([`ae49794`](https://togithub.com/discord-net/Discord.Net/commit/ae49794)) - [#​2956](https://togithub.com/discord-net/Discord.Net/issues/2956) Add missing role tags ([`6b691b1`](https://togithub.com/discord-net/Discord.Net/commit/6b691b1)) - [#​2957](https://togithub.com/discord-net/Discord.Net/issues/2957) Longer MaxCustomBlockMessageLength ([`bae7861`](https://togithub.com/discord-net/Discord.Net/commit/bae7861))

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