Update GreptimeDB URL in vendor list (#5497)

Author: shuiyisong

data/ecosystem/vendors.yaml

@@ -380,7 +380,7 @@
   commercial: true
 - name: GreptimeDB
   nativeOTLP: true
-  url: https://docs.greptime.com/user-guide/clients/otlp
+  url: https://docs.greptime.com/user-guide/ingest-data/for-observerbility/opentelemetry
   contact: [email protected]
   oss: true
   commercial: true

static/refcache.json

@@ -2747,6 +2747,10 @@
     "StatusCode": 200,
     "LastSeen": "2024-01-30T15:24:43.194115-05:00"
   },
+  "https://docs.greptime.com/user-guide/ingest-data/for-observerbility/opentelemetry": {
+    "StatusCode": 200,
+    "LastSeen": "2024-10-29T16:21:59.273877+08:00"
+  },
   "https://docs.groundcover.com/integrations/data-sources/opentelemetry/traces-and-logs": {
     "StatusCode": 200,
     "LastSeen": "2024-08-18T14:44:07.000049769Z"