skill calc: add 4 dose potions

Add 4 dose Extended Antifires and Anti-venoms to the herblore skill calculator. These potions are able and often are made using 4 doses at a time.

Super Antifires and Anti-venom+'s can not be made using 3 doses at a time, so were fixed to display the right potion dose (4). The xp for these potions was already correct.

runelite-client/src/main/resources/net/runelite/client/plugins/skillcalculator/skill_herblore.json

@@ -360,6 +360,12 @@
       "name": "Extended Antifire (3)",
       "xp": 82.5
     },
+    {
+      "level": 84,
+      "icon": 11951,
+      "name": "Extended Antifire (4)",
+      "xp": 110
+    },
     {
       "level": 86,
       "icon": 24635,
@@ -378,6 +384,12 @@
       "name": "Anti-venom(3)",
       "xp": 90
     },
+    {
+      "level": 87,
+      "icon": 12905,
+      "name": "Anti-venom(4)",
+      "xp": 120
+    },
     {
       "level": 90,
       "icon": 12695,
@@ -386,14 +398,14 @@
     },
     {
       "level": 92,
-      "icon": 21981,
+      "icon": 21978,
-      "name": "Super Antifire (3)",
+      "name": "Super Antifire (4)",
       "xp": 130
     },
     {
       "level": 94,
-      "icon": 12915,
+      "icon": 12913,
-      "name": "Anti-venom+(3)",
+      "name": "Anti-venom+(4)",
       "xp": 125
     },
     {