chore: Update github action to use newer Xcodes to test on

Author: kevinrenskers

.github/workflows/test.yml

@@ -5,8 +5,8 @@ on:
     branches:
       - main
   pull_request:
-    branches: 
-      - '*'
+    branches:
+      - "*"
 
 jobs:
   test-xcode:
@@ -15,9 +15,8 @@ jobs:
       matrix:
         # see https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners#supported-software for versions
         xcode:
-          - 11.7
-          - 12.5.1
-          - 13.2.1
+          - 14.3.1
+          - 15.2
 
     steps:
       - uses: actions/checkout@v2