Add conditional check for swift version

Author: JLESUS

.github/workflows/codeql-ios.yml

@@ -75,6 +75,7 @@ jobs:
           print("Inputs validated successfully.")
 
       - name: Force Swift version to 5.0 in Demo target
+        if: ${{ exists('Demo/Demo.xcodeproj/project.pbxproj')}}
         run: |
           sed -i '' 's/SWIFT_VERSION = 6.0;/SWIFT_VERSION = 5.0;/g' Demo/Demo.xcodeproj/project.pbxproj