MFH: r536292

Update to 2.6.4

Changelog:

• Fixed security issue in the Sync WebUI. Credits to Frantisek Uhrecky (fruh)

PR: 243518
Reported by: Volodymyr Kostyrko <arcade@b1t.name> (maintainer)
Sponsored by: Netzkommune GmbH

Approved by: ports-secteam (with hat)