version 1.39.0

Changes

• [slack-api-client] Add support for micronaut 4 - Thanks @hrothwell
• [slack-api-client] Many property addition to Web API response types - Thanks @seratch

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• All issues/pull requests: https://github.com/slackapi/java-slack-sdk/milestone/90?closed=1
• All changes: v1.38.3...v1.39.0