migrate away from deprecated TruffleFile APIs

Author: cosminbasca

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/util/FileDeleteShutdownHook.java

@@ -54,7 +54,7 @@ public FileDeleteShutdownHook(String path) {
 
     @Override
     public void call(PythonContext context) {
-        TruffleFile truffleFile = context.getEnv().getTruffleFile(path);
+        TruffleFile truffleFile = context.getEnv().getPublicTruffleFile(path);
         try {
             truffleFile.delete();
         } catch (IOException ignored) {}

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/util/TempFileUtils.java

@@ -80,7 +80,7 @@ public static String getRandomFilePath(String path, String prefix, String suffix
 
         while (true) {
             String tmpPath = path + env.getFileNameSeparator() + prefix + getRandomString(8) + suffix;
-            TruffleFile tmpFile = env.getTruffleFile(tmpPath);
+            TruffleFile tmpFile = env.getPublicTruffleFile(tmpPath);
             if (!tmpFile.exists()) {
                 tmpFile.createFile();
                 options.remove(StandardOpenOption.CREATE_NEW);