Now that I switched from zsh to Bash, I’m getting this message, which is annoying…

The default interactive shell is now zsh. To update your account to use zsh, please run chsh -s /bin/zsh. For more details, please visit https://support.apple.com/kb/HT208050.

According to the help article, I added the following to my .bash_profile and it went away.

export BASH_SILENCE_DEPRECATION_WARNING=1