update core rust submodule, if needed:
$ ./tools/update-core.sh
in Xcode:
adapt version ("View/Navigator/Project Navigator/deltachat-ios",
target "deltachat-ios", then "General/Version")
increase the build number in the same dialog
select "Generic iOS Device" in the toolbar
menu "Product/Archive" ... coffee ...
(codesign may ask for a password, this may be empty and "Enter" will do)
on success, a dialog with all releases on the machine is shown;
select the most newest, then "Distribute" -> "App Store Connect" -> "Upload"
leave default options (strip symbols: yes, upload symbols: yes),
in the summary, click "Upload" again ... two coffees ...