version 1.40.3

Changes

• [slack-api-client] #1337 Fix #1336 missing and invalid properties in rich text block elements - Thanks @seratch @Falit
• [slack-api-client] Add new properties to Web API responses - Thanks @seratch
• [bolt] Add missing properties in app_mention event payload - Thanks @seratch

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• All issues/pull requests: https://github.com/slackapi/java-slack-sdk/milestone/103?closed=1
• All changes: v1.40.2...v1.40.3