test: exclude IPv6 RIR delegation stats from strict smoke-test diffing

RIPE/ARIN/APNIC/AFRINIC/LACNIC delegation files update near-real-time;
total record counts ticked between capture and diff runs, unrelated to
any code change. Same class of fix as the earlier ASPA-feed and Atlas
probe exclusions.

server/__smoke__/baseline/baseline.json

@@ -3480,58 +3480,7 @@
   },
   "ipv6-adoption-stats": {
     "status": 200,
-    "body": {
+    "body": {}
-      "global_ipv6_pct": 21.23,
-      "total_ipv4_records": 260294,
-      "total_ipv6_records": 70134,
-      "by_rir": [
-        {
-          "rir": "RIPE",
-          "ipv4_records": 100022,
-          "ipv6_records": 26726,
-          "asn_records": 39587,
-          "ipv6_pct": 21.09,
-          "countries_with_ipv6": 111,
-          "countries_with_ipv4": 121
-        },
-        {
-          "rir": "ARIN",
-          "ipv4_records": 76686,
-          "ipv6_records": 11342,
-          "asn_records": 31724,
-          "ipv6_pct": 12.88,
-          "countries_with_ipv6": 46,
-          "countries_with_ipv4": 61
-        },
-        {
-          "rir": "APNIC",
-          "ipv4_records": 57866,
-          "ipv6_records": 16974,
-          "asn_records": 13739,
-          "ipv6_pct": 22.68,
-          "countries_with_ipv6": 76,
-          "countries_with_ipv4": 79
-        },
-        {
-          "rir": "AFRINIC",
-          "ipv4_records": 5454,
-          "ipv6_records": 1634,
-          "asn_records": 2753,
-          "ipv6_pct": 23.05,
-          "countries_with_ipv6": 53,
-          "countries_with_ipv4": 56
-        },
-        {
-          "rir": "LACNIC",
-          "ipv4_records": 20266,
-          "ipv6_records": 13458,
-          "asn_records": 14248,
-          "ipv6_pct": 39.91,
-          "countries_with_ipv6": 30,
-          "countries_with_ipv4": 30
-        }
-      ]
-    }
   },
   "atlas-coverage": {
     "status": 200,

server/__smoke__/compare-responses.js

@@ -105,6 +105,11 @@ const VOLATILE_PATHS = new Set([
   "health.caches.aspa_map.entries",
   "health.aspa_adoption.total_objects",
   "aspa-adoption-stats.current.delta_from_previous",
+  // RIR delegation files (RIPE/ARIN/APNIC/AFRINIC/LACNIC) update near-real-time
+  "ipv6-adoption-stats.global_ipv6_pct",
+  "ipv6-adoption-stats.total_ipv4_records",
+  "ipv6-adoption-stats.total_ipv6_records",
+  "ipv6-adoption-stats.by_rir",
 ]);
 
 function stripNondeterministic(obj, pathPrefix) {