Fix version of PathGraph used

Author: egregius313

java/ql/integration-tests/all-platforms/kotlin/kotlin_java_static_fields/test.ql

@@ -1,6 +1,6 @@
 import java
 import semmle.code.java.dataflow.DataFlow
-import DataFlow::PathGraph
+import Flow::PathGraph
 
 module Config implements DataFlow::ConfigSig {
   predicate isSource(DataFlow::Node n) { n.asExpr().(StringLiteral).getValue() = "taint" }