Prune old entries from refcache

Author: danielgblanco

static/refcache.json

@@ -12587,14 +12587,6 @@
     "StatusCode": 200,
     "LastSeen": "2025-01-06T11:32:22.440332-05:00"
   },
-  "https://opentelemetry.io/docs/languages/go/": {
-    "StatusCode": 206,
-    "LastSeen": "2025-01-17T12:58:27.368618Z"
-  },
-  "https://opentelemetry.io/docs/languages/go/getting-started/#instrument-the-http-server": {
-    "StatusCode": 206,
-    "LastSeen": "2025-01-17T12:58:28.687325Z"
-  },
   "https://opentracing.io": {
     "StatusCode": 206,
     "LastSeen": "2024-12-18T06:36:29.862015-05:00"