Timestamp server used in code_signing.py is no longer available

[Thom BENTLEY]

I'm building on Windows 10 using a version of https://github.com/google/omaha that was forked sometime in 2019.  The timestamp server used in the code is no longer available.
The value used is http://timestamp.verisign.com/scripts/timestamp.dll.
I saw some code that suggests I can override it by setting an environment variable called TIMESTAMP_SERVER.  However this doesn't not seem to work.  The environment variable is ignored.

Default is set here:

https://github.com/google/omaha/blob/137e25a5f91998dfbb7165c7938129a3977894a6/omaha/site_scons/site_tools/code_signing.py#L62
The override is here: https://github.com/google/omaha/blob/137e25a5f91998dfbb7165c7938129a3977894a6/omaha/site_scons/site_tools/code_signing.py#L127

I must be hitting a path that doesn't check for the environment variable override.

Any suggestions other than editing the code?
Thanks!

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