The ZoneInfo class was added in python version 3.9, and the Alpine timezone package is already installed in the Containerfile as part of the runtime dependencies.
zoneinfo provides instances of the same timezone class already used for the existing OFFSET timezones (making it a drop-in accessible option), but implements them using an IANA timezone database (making it historically accurate, and hopefully, future accurate on new builds as well).
The implementation in this commit by default only overrides if LOCATION_TIMEZONE both hasn't been set and is in the installed tzdata package, making it fully backwards compatible with existing options.
If a user has a slow internet connection or is using a low-power device they may wish to not render icons at all to prevent additional cpu/network load. Defaults to `true` to preserve existing behavior.
