Reproducible. Not an issue as Electrum won't run if it is a critical problem.
In your terminal, install pip and then upgrade requests.
sudo apt-get install python-pip3
pip3 install requests -U
Thanks for your suggestion but I do not wish to install pip because I do not want to install Electrum. The latter can be run without it being installed (
https://electrum.org/#download)
Electrum uses requests-2.25.1 but Debian 10 doesn't have that.
Do you think Debian 11 (Bullseye) will have "requests-2.25.1"? If yes, I can wait for Debian 11 to become a stable release. It is only a few months from now.