Thank you! Problem solved! I followed the advice offered by Vineet Singh in the 13 Jun 2021 stackoverflow article:
> sudo yum search tkinter
> sudo yum install python3-tkinter.x86_64
The yum asked to upgrade three packages:
python-unversioned-command noarch 3.8.10-1.fc32 updates 11 k
python3 x86_64 3.8.10-1.fc32 updates 28 k
python3-libs x86_64 3.8.10-1.fc32 updates 7.4 M
The upgrade took about ten seconds. I then verified the install and verified that my python Telegram bot support is intact.
Out of curiosity, I wonder why pip was able to install pyTelegramBotAPI but not tkinter.
$ pip install pyTelegramBotAPI -- # works
$ pip install tkinter --user # fails