Add test for curl_upkeep()

Author: adoy

ext/curl/tests/curl_upkeep_001.phpt

@@ -0,0 +1,15 @@
+--TEST--
+curl_upkeep() function
+--EXTENSIONS--
+curl
+--SKIPIF--
+<?php
+if (curl_version()['version_number'] < 0x073e00) die('skip requires curl >= 7.62.0');
+?>
+--FILE--
+<?php
+$ch = curl_init();
+var_dump(curl_upkeep($ch));
+?>
+--EXPECT--
+bool(true)