Fixed: upgrading Roundcube 1.6.0~ynh4 to 1.6.7~ynh1 was failing

[gemlog]

Describe the bug

A clear and concise description of what the bug is.
it would just break with this log content:
https://paste.yunohost.org/raw/axebayixiq

Context

• Hardware: *VPS at contabo.de

• YunoHost version: 11.2.20.2 (stable).

• If you performed a command from the CLI, the command itself is enough. For example:
  as root, I cd'd to /var/www/roundcube and deleted 'composer.lock'
  After re-running the upgrade, it then completed successfully.
  I could see the log file in the log, but I read about deleting it in these forums. Thanks very much.
  I'd been clicking idly on upgrade every once in a while for months actually, but... it kept working and no scary security news, so I ignored it until just now.
  Thanks all you guys. Wonderful work is yunoh.

[gemlog]

I meant 'lock file' in the log file... oops.