Use mkstemp to replace deprecated mktemp (huggingface#23372)

* Use `mkstemp` to replace deprecated `mktemp`

The `tempfile.mktemp` function is [deprecated](https://docs.python.org/3/library/tempfile.html#tempfile.mktemp) due to [security issues](https://cwe.mitre.org/data/definitions/377.html).

* Update src/transformers/utils/hub.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

---------

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

src/transformers/utils/hub.py

@@ -578,7 +578,7 @@ def download_url(url, proxies=None):
         " that this is not compatible with the caching system (your file will be downloaded at each execution) or"
         " multiple processes (each process will download the file in a different temporary file)."
     )
-    tmp_file = tempfile.mktemp()
+    tmp_file = tempfile.mkstemp()[1]
     with open(tmp_file, "wb") as f:
         http_get(url, f, proxies=proxies)
     return tmp_file