chore(deps): update dependency com.github.twitch4j:twitch4j to v1.21.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.github.twitch4j:twitch4j (source)	1.20.0 -> 1.21.0

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Release Notes

twitch4j/twitch4j (com.github.twitch4j:twitch4j)

### [`v1.21.0`](https://togithub.com/twitch4j/twitch4j/releases/tag/v1.21.0) [Compare Source](https://togithub.com/twitch4j/twitch4j/compare/v1.20.0...v1.21.0) #### Bug Fixes - populate SentChatMessage#isSent ([#​967](https://togithub.com/twitch4j/twitch4j/issues/967)) - reassociate conduit shards with pool after unexpected disconnects ([#​1003](https://togithub.com/twitch4j/twitch4j/issues/1003)) - **pubsub**: fire HypeTrainStartEvent and add new hype train fields ([#​1001](https://togithub.com/twitch4j/twitch4j/issues/1001)) #### Features - **eventsub**: add whisper received topic ([#​970](https://togithub.com/twitch4j/twitch4j/issues/970)) - **eventsub**: add new automatic reward types ([#​987](https://togithub.com/twitch4j/twitch4j/issues/987)) - **eventsub**: add vip add and remove topics ([#​969](https://togithub.com/twitch4j/twitch4j/issues/969)) - **eventsub**: add automod caught message topics ([#​988](https://togithub.com/twitch4j/twitch4j/issues/988)) - **eventsub**: add suspicious users eventsub topics ([#​979](https://togithub.com/twitch4j/twitch4j/issues/979)) - **pubsub**: add outbound follows unofficial topic ([#​984](https://togithub.com/twitch4j/twitch4j/issues/984)) - implement warnings open beta for helix and eventsub ([#​994](https://togithub.com/twitch4j/twitch4j/issues/994)) - add events for new chat warnings feature ([#​992](https://togithub.com/twitch4j/twitch4j/issues/992)) - support new bits cheer creator goal types ([#​971](https://togithub.com/twitch4j/twitch4j/issues/971)) - add msg_concurrent_channel_limit_reached to NoticeTag ([#​985](https://togithub.com/twitch4j/twitch4j/issues/985)) - implement channel.moderate eventsub topic ([#​978](https://togithub.com/twitch4j/twitch4j/issues/978)) - allow auth requests to be directed to cli mock api ([#​990](https://togithub.com/twitch4j/twitch4j/issues/990)) - add irc and pubsub support for new automatic rewards ([#​993](https://togithub.com/twitch4j/twitch4j/issues/993)) #### Refactor - **eventsub**: change superclass for shield mode events ([#​976](https://togithub.com/twitch4j/twitch4j/issues/976)) - **helix**: clarify Stream thumbnail url getters ([#​977](https://togithub.com/twitch4j/twitch4j/issues/977)) - **helix**: utilize ValueWrapper in more classes ([#​1005](https://togithub.com/twitch4j/twitch4j/issues/1005)) #### Internal - promote chat warnings to v1 ([#​1008](https://togithub.com/twitch4j/twitch4j/issues/1008)) - deprecate public setters that can be misleading ([#​997](https://togithub.com/twitch4j/twitch4j/issues/997)) - **pubsub**: deprecate HypeTrainCooldownExpirationEvent ([#​1002](https://togithub.com/twitch4j/twitch4j/issues/1002)) - update dependency gradle to v8.9 ([#​1007](https://togithub.com/twitch4j/twitch4j/issues/1007)) - update dependency com.github.philippheuer.credentialmanager:credentialmanager to v0.3.1 ([#​1010](https://togithub.com/twitch4j/twitch4j/issues/1010)) - update com.github.philippheuer.events4j to v0.12.2 ([#​1009](https://togithub.com/twitch4j/twitch4j/issues/1009)) - update com.fasterxml.jackson to v2.17.2 ([#​1004](https://togithub.com/twitch4j/twitch4j/issues/1004)) - update org.jetbrains.kotlinx to v1.8.1 ([#​982](https://togithub.com/twitch4j/twitch4j/issues/982)) - update dependency commons-io:commons-io to v2.16.1 ([#​966](https://togithub.com/twitch4j/twitch4j/issues/966)) - update dependency org.slf4j:slf4j-api to v2.0.13 ([#​972](https://togithub.com/twitch4j/twitch4j/issues/972)) - update plugin org.jetbrains.kotlin.jvm to v2 ([#​986](https://togithub.com/twitch4j/twitch4j/issues/986)) - update dependency org.junit:junit-bom to v5.10.3 ([#​999](https://togithub.com/twitch4j/twitch4j/issues/999)) - update dependency org.projectlombok:lombok to v1.18.34 ([#​1000](https://togithub.com/twitch4j/twitch4j/issues/1000)) - update io.github.openfeign to v13.3 ([#​995](https://togithub.com/twitch4j/twitch4j/issues/995)) - update plugin io.github.goooler.shadow to v8.1.8 ([#​998](https://togithub.com/twitch4j/twitch4j/issues/998)) - update dependency org.mockito:mockito-bom to v5.12.0 ([#​983](https://togithub.com/twitch4j/twitch4j/issues/983)) - add security policy ([#​973](https://togithub.com/twitch4j/twitch4j/issues/973))

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