Apache won't start without all the certificates it expects, and the latest certificate is not where the config says.
Your log says
Certificate is saved at: /etc/letsencrypt/live/radicale.powerbang.ovh-0001/fullchain.pem
But apache expects:
mai 17 22:50:49 rpi3 httpd[375484]: SSLCertificateFile: file '/etc/letsencrypt/live/radicale.powerbang.ovh/fullchain.pem' does not exist or is empty
I assumed the certificate wasn't there because it was a fresh certbot install, but the -0001 tells me something else might be going on.