remove depricated url method

Author: kumargu

libs/agent-sm/agent-policy/src/main/java/org/opensearch/secure_sm/policy/PolicyFile.java

@@ -17,6 +17,8 @@
 import java.net.MalformedURLException;
 import java.net.NetPermission;
 import java.net.SocketPermission;
+import java.net.URI;
+import java.net.URISyntaxException;
 import java.net.URL;
 import java.net.URLDecoder;
 import java.nio.charset.StandardCharsets;
@@ -341,8 +343,8 @@ private static class PolicyInfo {
         }
     }
 
-    @SuppressWarnings("deprecation")
-    private static URL newURL(String spec) throws MalformedURLException {
-        return new URL(spec);
+    private static URL newURL(String spec) throws MalformedURLException, URISyntaxException {
+        
+        return new URI(spec).toURL();
     }
 }