iOS SDK version 16 (XCode 14) is not supported anymore

[ivard]

We should build using macos-14 (the new latest) instead of macos-13, and we should use XCode 15 instead of XCode 14. We might also have to update Flutter when our current Flutter version has no support for XCode 15. Apple does not accept our builds anymore due to this.

Take into account that issue #273 should be resolved when upgrading.

MacOS runner:

irmamobile/.github/workflows/delivery.yml

Line 13 in 012ea86

runs-on: macos-13

(and many other occurances)

XCode version:

irmamobile/ci_scripts/select_xcode.sh

Line 4 in 012ea86

XCODE_VERSION="14.3.1"