TimePickerElement dictionary is not being parsed

[iress-willygo]

(Filling out the following details about bugs will help us solve your issue sooner.)

Reproducible in:

The Slack SDK version

slack-sdk==3.13.0

Python runtime version

Python 3.9.2

OS info

#1 SMP Debian 5.10.92-1 (2022-01-18)

Steps to reproduce:

(Share the commands to run, source code, and project settings (e.g., setup.py))

1. Create a TimePickerElement dictionary
2. Pass it to BlockElement.parse()

Expected result:

TimePickerElement object is returned

Actual result:

None is returned

Requirements

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