version 3.23.0

Changes

• #1406 Add RichTextInputElement to slack_sdk.models - Thanks @seratch
• #1408 Update files.upload v2 method in correspondence with server-side changes - Thanks @seratch

Since this version, developers no longer need files:read permission for files_upload_v2 method. To learn more about files_upload_v2, please refer to v3.19.0 release notes: https://github.com/slackapi/python-slack-sdk/releases/tag/v3.19.0

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• All issues/pull requests: https://github.com/slackapi/python-slack-sdk/milestone/84?closed=1
• All changes: v3.22.0...v3.23.0