Remove unsafe flags from Package.swift

(cherry picked from commit bc3468ec563036557fd6824ab4673549b99b8bab)

Author: mbrandonw

Package.swift

@@ -76,16 +76,16 @@ let package = Package(
   ]
 )
 
-for target in package.targets {
-  target.swiftSettings = target.swiftSettings ?? []
-  target.swiftSettings?.append(
-    .unsafeFlags([
-      //"-Xfrontend", "-warn-concurrency",
-      //"-Xfrontend", "-enable-actor-data-race-checks",
-      //"-enable-library-evolution",
-    ])
-  )
-}
+//for target in package.targets {
+//  target.swiftSettings = target.swiftSettings ?? []
+//  target.swiftSettings?.append(
+//    .unsafeFlags([
+//      "-Xfrontend", "-warn-concurrency",
+//      "-Xfrontend", "-enable-actor-data-race-checks",
+//      "-enable-library-evolution",
+//    ])
+//  )
+//}
 
 #if swift(>=5.6)
   // Add the documentation compiler plugin if possible