CERTIFICATE_VERIFY_FAILED since September 30, 2021

Since today TortoiseHG 5.9.1 fails to verify certificates:

URLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:727)

Probably because: https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/

DST Root CA X3 will expire on September 30, 2021 That means those older devices that don’t trust ISRG Root X1 will start getting certificate warnings when visiting sites that use Let’s Encrypt certificates.

ISRG Root X1 is in the Windows certificate store.

I guess the reason TortoiseHG fails is because it uses "certifi" (which "provides Mozilla’s carefully curated collection of Root Certificates" https://pypi.org/project/certifi/ ) instead of just using the normal Windows certificate store.

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