update explicit Xcode version to 15.4

.github/workflows/build_LoopFollow.yml

@@ -24,7 +24,7 @@ jobs:
     steps:
       # Uncomment to manually select latest Xcode if needed
       - name: Select Latest Xcode
-        run: "sudo xcode-select --switch /Applications/Xcode_15.0.app/Contents/Developer"
+        run: "sudo xcode-select --switch /Applications/Xcode_15.4.app/Contents/Developer"
 
       # Checks-out the repo
       - name: Checkout Repo