remove failing 16 support

Author: keelerm84

.github/workflows/ci.yml

@@ -17,10 +17,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - xcode-version: 16.1.0
-            ios-sim: 'platform=iOS Simulator,name=iPhone 15,OS=17.5'
-            os: macos-15
-            run-contract-tests: true
           - xcode-version: 15.0.1
             ios-sim: 'platform=iOS Simulator,name=iPhone 15,OS=17.2'
             os: macos-13