Using a stack with exact Xcode version

follow up on: Simplifying and merging Xcode versions in the Bitrise Stacks
not being able to set an exact Xcode version (e.g. Xcode14.3 instead of 14.3.x) leads to unsolvable build errors when using external binary dependencies in Xcode projects.

We currently use a Realm binary which is build with Xcode14.3 but Bitrise already update the stack to use Xcode14.3.1. which does fail all our builds until Realm upgrades.

It really is necessary to pin an exact Xcode version to be able to have a stable CI environment.

meta: stack: osx-xcode-14.3.0-ventura machine_type_id: g2-m1.4core