Revert changes in swift_windows.yml

There appears to be a problem with respect to installing Swift
on the Windows container in the GitHub Action. Once things
settle down and it works again, the action will once again run
whenever the main branch is being pushed.

Author: MasterJ93

.github/workflows/swift_windows.yml

@@ -1,8 +1,8 @@
 name: Build Swift Package on Windows
 
 on:
-  push:
-    branches: [ "main" ]
+  # push:
+  #   branches: [ "main" ]
   workflow_dispatch:
 
 jobs: