Reorder Xcode matrix

Author: hannesa2

.github/workflows/BuildPR.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        xcode: [ Xcode_12.5, Xcode_13.1, Xcode_13.2.1, Xcode_13.0, Xcode_12.4 ]
+        xcode: [ Xcode_12.4, Xcode_12.5, Xcode_13.1, Xcode_13.2.1 ]
     steps:
       - name: Checkout
         uses: actions/[email protected]