chore(labels): add severity low, high, and critical labels (#3068)

Author: tusharmath

.github/labels.json

@@ -327,5 +327,23 @@
     "color": "F9C74F",
     "description": "This bounty has been completed and the reward paid out.",
     "aliases": ["bounty:rewarded", "bounty:earned"]
+  },
+  {
+    "name": "severity: low",
+    "color": "FFEB3B",
+    "description": "Minor impact; does not significantly affect functionality.",
+    "aliases": ["severity:low"]
+  },
+  {
+    "name": "severity: high",
+    "color": "FF9800",
+    "description": "Significant impact; core functionality is impaired.",
+    "aliases": ["severity:high"]
+  },
+  {
+    "name": "severity: critical",
+    "color": "B71C1C",
+    "description": "Severe impact; system is unusable or data is at risk.",
+    "aliases": ["severity:critical", "critical"]
   }
 ]