Expect the correct module name for Python's 3.14 argparse output (ESPTOOL-997)

[befeleme]

This fixes the upcoming issue with Python 3.14: the changed output of argparse help, which will newly print out the program name rather than the name of the file, __main__.py.

This change fixes the following bug(s):

#1054

I have tested this change with the following hardware & software combinations:

NO TESTING

I have run the esptool.py automated integration tests with this change and the above hardware:

NO TESTING

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[Honza0297]

Thanks for the contribution, @befeleme, changes LGTM. Can you please rebase to the newest commit?

[befeleme]

Done