Looks like a similar issue as reported here:
Follow @tflidd’s advice.
ref: Update 12.0.0 -->12.0.3 fails on 1und1 Webhosting · Issue #143 · nextcloud/updater · GitHub
Looks like a similar issue as reported here:
Follow @tflidd’s advice.
ref: Update 12.0.0 -->12.0.3 fails on 1und1 Webhosting · Issue #143 · nextcloud/updater · GitHub