v0.62.1-beta release

Fixes since 0.62.0-beta:

•  fix loading reference link titles in read-only text notes, closes #4404 
•  fix content renderer of protected canvas/mermaid notes, closes #4414 
•  fix assigning extension to attachment export filenames, closes #4415 
•  Migrate [email protected] from libraries to [email protected] in node_modules #4417 
• revert general HTML support 
• change the way frontend detects content change which works even if no new blob is created, fixes #4434