version 1.22.2

Changes

• [slack-api-model] #994 Add missing properties to ChannelDeletedEvent - Thanks @seratch
• Upgrade Kotlin version to 1.7 - Thanks @seratch

Document Updates

• #988 #989 Link getting started instructions for gradle to the gradle app quickstart - Thanks @filmaj
• #988 #990 Small improvements to the getting started documents for Bolt - Thanks @filmaj
• #991 Update Japanese documents to have #990 changes - Thanks @seratch

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• All issues/pull requests: https://github.com/slackapi/java-slack-sdk/milestone/60?closed=1
• All changes: v1.22.1...v1.22.2