Jitsi's repositories have rotated keys, this removes the previous key if
necessary and ensures the new key is present.
Can't be merged until following lands:
https://code.ungleich.ch/ungleich-public/cdist/-/merge_requests/994
since we rely on `--use-deprecated-apt-key` and the improvements in the type to
modify the keyring in a reliable fashion.
This also updates the exporter to version 1.1.5 released on April 25th 2021.