GitHub Actions: Update Xcode to 12.3
diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index c3fadd1..6f3dce9 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -10,7 +10,7 @@
 
 env:
   # See: https://github.com/actions/virtual-environments/tree/main/images/macos
-  XCODE_DEV_PATH: /Applications/Xcode_12.2.app/Contents/Developer
+  XCODE_DEV_PATH: /Applications/Xcode_12.3.app/Contents/Developer
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs: