Fix index bounds check in README entry processing

Author: SaurabhCodesAI

scripts/shared.py

@@ -220,7 +220,7 @@ def update_readme(
         entry_start_index = lines.index(entry_start_line)
         entry_end_index = lines.index(entry_end_line)
         # Include any trailing empty/whitespace-only lines
-        while not lines[entry_end_index + 1].strip():
+        while entry_end_index + 1 < len(lines) and not lines[entry_end_index + 1].strip():
             entry_end_index += 1
     # Initalize variables of entry is not present
     else: