Xcode version update

[stechiu]

Summary of changes

• Bumped Xcode version to 15.0

https://developer.apple.com/support/xcode/

Checklist

• Added a changelog entry

Authors

List GitHub usernames for everyone who contributed to this pull request.

• @stechiu

[jaxdesmarais]

The SPM failure is due to this work being done off of a fork and the UI tests failure has been consistent across the last few PRs.

[scannillo]

Should we also bump the Package.swift (here) & Podpsec (here) to the newer Swift version too?

Otherwise we can't leverage new language features when building for those packages

Cc: @jaxdesmarais

[jaxdesmarais]

Should we also bump the Package.swift (here) & Podpsec (here) to the newer Swift version too?

Otherwise we can't leverage new language features when building for those packages

Well, we aren't using Swift at all here. 🙈 But yeah I don't see why we couldn't bump those and eventually we can take advantage of those features! @stechiu do you want to bump those in this PR?

[stechiu]

Should we also bump the Package.swift (here) & Podpsec (here) to the newer Swift version too?
Otherwise we can't leverage new language features when building for those packages

Well, we aren't using Swift at all here. 🙈 But yeah I don't see why we couldn't bump those and eventually we can take advantage of those features! @stechiu do you want to bump those in this PR?

Awesome, made the changes so I think we're good now

[jaxdesmarais]

We will also want to bump this to Swift 5.9:

braintree-ios-drop-in/Package.swift

Line 1 in 07807c9

// swift-tools-version:5.7

[stechiu]

We will also want to bump this to Swift 5.9:

braintree-ios-drop-in/Package.swift

Line 1 in 07807c9

// swift-tools-version:5.7

🤦‍♀️ I did make the change and could've sworn that I merged it in yesterday...