Grafana backup not works for 11.6.0 version

[borjasueiro]

Fix save_dashboard_versions.py line 52. Now content is a dict with 'versions' as a key:

...
 52  get_individual_versions(content['versions'], board_folder_path, log_file, grafana_url, http_get_headers, verify_ssl, client_cert, debug, pretty_print)
...

[herbetom]

I've found https://github.com/DuraCHYo/grafana-backup-tool via #283 (comment).

There is the following commit which might fix this? DuraCHYo@b1d5457

But tbh. i'm not too sure wheter it would be good idea to switch to that fork. Haven't really loked at it and it's quality.