generate-excludelist fails to retrieve the exclude list

[NissimBendanan]

This is what I get when I run wget manually:
wget https://raw.githubusercontent.com/probonopd/AppImages/master/excludelist -O -
ERROR: cannot verify raw.githubusercontent.com's certificate, issued by ‘CN=DigiCert TLS RSA SHA256 2020 CA1,O=DigiCert Inc,C=US’:
Unable to locally verify the issuer's authority.
To connect to raw.githubusercontent.com insecurely, use `--no-check-certificate'.

running with --no-check-certificate works but I don't want to use this option.

do i need to install or configure something?

[NissimBendanan]

running under root is also working
sudo wget https://raw.githubusercontent.com/probonopd/AppImages/master/excludelist -O -

but this is not an option that I want