Refactor Dockerfile and main.py for improved environment variable handling and logging; update requirements.txt for package specifications

dtek_notif/requirements.txt

@@ -1,3 +1,5 @@
-bs4
-requests
-aiogram
+requests>=2.31.0
+beautifulsoup4>=4.12.0
+aiogram>=3.3.0
+python-dotenv>=1.0.0
+aiohttp>=3.9.0