Rust: Have CleartextTransmissionSink extend QuerySink::Range.

Author: geoffw0

rust/ql/lib/codeql/rust/security/CleartextTransmissionExtensions.qll

@@ -5,14 +5,17 @@
 
 private import codeql.util.Unit
 private import rust
+private import codeql.rust.Concepts
 private import codeql.rust.dataflow.DataFlow
 private import codeql.rust.dataflow.FlowSink
 
 /**
  * A data flow sink for cleartext transmission vulnerabilities. That is,
  * a `DataFlow::Node` of something that is transmitted over a network.
  */
-abstract class CleartextTransmissionSink extends DataFlow::Node { }
+abstract class CleartextTransmissionSink extends QuerySink::Range {
+  override string getSinkType() { result = "CleartextTransmission" }
+}
 
 /**
  * A barrier for cleartext transmission vulnerabilities.