Update arbitrum_mainnet.json (#832)

Author: KemarTiti

pages/price-feeds/sponsored-feeds/data/evm/arbitrum_mainnet.json

@@ -6,6 +6,20 @@
     "price_deviation": 1,
     "confidence_ratio": 100
   },
+  {
+    "alias": "USR/USD.RR",
+    "id": "512a79cc65f49531f0bbb72956353e79ecdc1e4a6e5241847196c1f9a11d8a52",
+    "time_difference": 21600,
+    "price_deviation": 0.5,
+    "confidence_ratio": 100
+  },
+  {
+    "alias": "WSTUSR/USR.RR",
+    "id": "b74c2bc175c2dab850ce5a5451608501c293fe8410cb4aba7449dd1c355ab706",
+    "time_difference": 21600,
+    "price_deviation": 0.5,
+    "confidence_ratio": 100
+  },
   {
     "alias": "RLP/USD.RR",
     "id": "796bcb684fdfbba2b071c165251511ab61f08c8949afd9e05665a26f69d9a839",