fix: Replace datetime.UTC with timezone.utc for Python 3.9 compatibility

datetime.UTC was introduced in Python 3.11. Using timezone.utc instead
for compatibility with Python 3.9 and 3.10.

Author: tech4242

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
 
     steps:
     - uses: actions/checkout@v4

README.md

@@ -2,7 +2,7 @@
   <img src="tests/mcphawk_logo.png" alt="MCPHawk Logo" height="130">
 
   [![CI](https://github.com/tech4242/mcphawk/actions/workflows/ci.yml/badge.svg)](https://github.com/tech4242/mcphawk/actions/workflows/ci.yml)
-  [![Python](https://img.shields.io/badge/python-3.8+-blue.svg)](https://www.python.org/downloads/)
+  [![Python](https://img.shields.io/badge/python-3.9+-blue.svg)](https://www.python.org/downloads/)
   [![FastAPI](https://img.shields.io/badge/FastAPI-005571?style=flat&logo=fastapi)](https://fastapi.tiangolo.com/)
   [![Vue.js](https://img.shields.io/badge/vue.js-3.x-brightgreen.svg)](https://vuejs.org/)
   [![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)

mcphawk/logger.py

@@ -1,6 +1,6 @@
 import logging
 import sqlite3
-from datetime import UTC, datetime
+from datetime import datetime, timezone
 from pathlib import Path
 from typing import Any
 
@@ -58,7 +58,7 @@ def log_message(entry: dict[str, Any]) -> None:
             direction (str): 'incoming', 'outgoing', or 'unknown'
             message (str)
     """
-    timestamp = entry.get("timestamp", datetime.now(tz=UTC))
+    timestamp = entry.get("timestamp", datetime.now(tz=timezone.utc))
     conn = sqlite3.connect(DB_PATH)
     cur = conn.cursor()
     cur.execute(

mcphawk/sniffer.py

@@ -1,7 +1,7 @@
 import asyncio
 import logging
 import platform
-from datetime import UTC, datetime
+from datetime import datetime, timezone
 
 # Suppress Scapy warnings before importing
 logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
@@ -48,7 +48,7 @@ def packet_callback(pkt):
             if decoded.startswith("{") and "jsonrpc" in decoded:
                 logger.debug(f"Sniffer captured: {decoded}")
 
-                ts = datetime.now(tz=UTC)
+                ts = datetime.now(tz=timezone.utc)
                 src_port = pkt[TCP].sport if pkt.haslayer(TCP) else 0
                 dst_port = pkt[TCP].dport if pkt.haslayer(TCP) else 0