version 1.28.0

Changes

• [all] #1119 Upgrade Lombok/Kotlin patch versions (and optional others too) - Thanks @seratch
• [bolt] #1126 Add thread_ts parameter to response_url sender inputs - Thanks @seratch
• [slack-api-client] #1117 Fix #1082 Add admin.roles.{list|add|remove}Assignments API supports - Thanks @seratch
• [slack-api-client] #1123 Fix #1122 A request toward an invalid webhook URL get 200 OK response (expected: 302 redirection) - Thanks @tsasaki609 @seratch
• [docs] #1116 #1118 Fix document errors - Thanks @JonGilmore

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• All issues/pull requests: https://github.com/slackapi/java-slack-sdk/milestone/72?closed=1
• All changes: v1.27.3...v1.28.0