Chore: update to fastlane 2.335.0 and Xcode 26.4

[bjorkert]

Purpose

Use the most recent version of fastlane, 2.233.1, and address dependabot security issues with the Gemfile.lock file.

Mirrors LoopKit/LoopWorkspace#437.

Method

Update to fastlane 2.233.1

1. Modify Gemfile for fastlane 2.233.1
2. In Terminal, run bundle install
3. Commit the modified Gemfile and Gemfile.lock

Address security issues

1. Modify Gemfile to add gem "json", ">=2.19.2" and gem "addressable", ">=2.9.0"
2. In Terminal, run bundle install
3. Commit the modified Gemfile and Gemfile.lock

[marionbarker]

I forgot I don't have privileges to edit this PR name and comments.

Updated the action for this PR

Since this has not been merged yet and we have an updated fastlane release 2.335.0, I pushed those update to the loopandlearn branch that is driving this PR.

So the new version both updates to fastlane 2.335.0 and updates Xcode version to 26.4, which is now the default version for GitHub actions.

@bjorkert - would you please rename the PR to reflect these updates.

Test

I tested the build and installed from TestFlight on an SE 2nd gen phone with this branch as the default branch

• https://github.com/docs-test/LoopCaregiver/actions/runs/26688727032

[bjorkert]

Renamed.