version 1.16.0

Changes

• [slack-api-client] Add newly added properties in Events API payloads / Web API responses - Thanks @seratch
• [bolt-micronaut] #903 Fix #891 Migrate Micronaut version to 3.2 - Thanks @seratch @volgin
• [all] #905 Upgrade optional module dependencies' minor/patch versions - Thanks @seratch
• [all] #898 Add GitHub stale action for better triaging issues - Thanks @srajiang @seratch
• [docs] #902 Replace instances of "event" with "request" in docs - Thanks @wongjas

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• All issues/pull requests: https://github.com/slackapi/java-slack-sdk/milestone/44?closed=1
• All changes: v1.15.0...v1.16.0