Swift: Add missing imports in ExternalFlow.qll.

Author: geoffw0

swift/ql/lib/codeql/swift/dataflow/ExternalFlow.qll

@@ -97,9 +97,12 @@ private module Frameworks {
   private import codeql.swift.frameworks.Alamofire.Alamofire
   private import codeql.swift.security.CleartextLoggingExtensions
   private import codeql.swift.security.CleartextStorageDatabaseExtensions
+  private import codeql.swift.security.ECBEncryptionExtensions
+  private import codeql.swift.security.HardcodedEncryptionKeyExtensions
   private import codeql.swift.security.PathInjectionExtensions
   private import codeql.swift.security.PredicateInjectionExtensions
   private import codeql.swift.security.StringLengthConflationExtensions
+  private import codeql.swift.security.WeakSensitiveDataHashingExtensions
 }
 
 /**