chore: update labels.json config

Author: seantrane

.github/labels.json

@@ -34,6 +34,18 @@
     "name": "effort: 13",
     "color": "fbca04"
   },
+  {
+    "name": "effort: 20",
+    "color": "fb4e04"
+  },
+  {
+    "name": "effort: 50",
+    "color": "fb0435"
+  },
+  {
+    "name": "effort: 100",
+    "color": "fb04b1"
+  },
   {
     "name": "good first issue",
     "color": "7057ff",