TortoiseSVN missing CA Certificate

Hello TortoiseSVN developers,

I host a small SVN server for my university project team and have a Let's 
Encrypt TLS certificate. Today we started getting this error:

C:\Users\mtrescott\Documents\formulasae>svn up
Updating '.':
Error validating server certificate for 
'https://fsae-demo.trescott.net:443':
 - The certificate is not issued by a trusted authority. Use the
   fingerprint to validate the certificate manually!
Certificate information:
 - Hostname: trescott.net
 - Valid: from Aug  4 05:36:20 2021 GMT until Nov  2 05:36:18 2021 GMT
 - Issuer: R3, Let's Encrypt, US
 - Fingerprint: 07:D0:B7:05:56:E1:76:29:BC:30:82:10:22:DF:29:4B:5F:5B:6A:6D
(R)eject, accept (t)emporarily or accept (p)ermanently? t

I believe the problem is caused by Tortoise not including the ISRG Root X1 
CA certificate. Let's Encrypt has an article about this. 
https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/

It's not too inconvenient because we can just manually trust the 
certificate, but it would be helpful to have this CA certificate included, 
since we'd have a permanent fix then.

Best regards,
Matt

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