Updated CI Xcode versions (SwiftUIX#373)

Author: Brett-Best

.github/workflows/workflow.yml

@@ -9,11 +9,13 @@ jobs:
       fail-fast: false
       matrix:
         os: [macos-11, macos-12]
-        xcode: ['13.1', '13.2.1', '13.3']
+        xcode: ['13.1', '13.2.1', '13.3.1', '13.4']
         build_type: ['debug', 'release']
         exclude:
           - os: macos-11
-            xcode: '13.3'
+            xcode: '13.3.1'
+          - os: macos-11
+            xcode: '13.4'
     runs-on: ${{ matrix.os }}
     env:
       DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer