Remove py dependency.

[donghaiwang]

Description

Remove the remaining issues from this commit , otherwise an error will be reported when execute make PythonAPI:

-[BuildPythonAPI]: [Batch params]: --py3
信息: 用提供的模式无法找到文件。
-[BuildPythonAPI]: [ERROR] An error ocurred while executing the py.
-[BuildPythonAPI]: [ERROR] Possible causes:
-[BuildPythonAPI]: [ERROR]  - Make sure "py" is installed.
-[BuildPythonAPI]: [ERROR]  - py = python launcher. This utility is bundled with Python installation but not installed by default.
-[BuildPythonAPI]: [ERROR]  - Make sure it is available on your Windows "py".
make: *** [Util/BuildTools/Windows.mk:62: PythonAPI] Error 1

Where has this been tested?

• Platform(s): Windows 11
• Python version(s): Python 3.7
• Unreal Engine version(s): 4.26

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This change is 

[update-docs[bot]]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would update our CHANGELOG.md based on your changes.

[Blyron]

Thanks for your contribution, we really appreciate it!