ci(metrics): use Pushgateway PUT to replace stale suite metrics

scripts/publish_test_metrics.py

@@ -75,7 +75,7 @@ def _post_text(url: str, payload: str) -> None:
     req = urllib.request.Request(
         url,
         data=payload.encode("utf-8"),
-        method="POST",
+        method="PUT",
         headers={"Content-Type": "text/plain"},
     )
     with urllib.request.urlopen(req, timeout=10) as resp: