🔒 Fix missing timeout in query_databases.py urllib.request.urlopen calls

[edithatogo]

🎯 What: Added a 10-second timeout to urllib.request.urlopen in fetch_url.
⚠️ Risk: Missing timeout can lead to indefinite hanging (DoS/resource exhaustion) if a remote server stops responding.
🛡️ Solution: Introduced a TIMEOUT_SECONDS constant and passed it as the timeout argument. Also added a unit test to verify that timeout exceptions are gracefully caught and handled.

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PR created automatically by Jules for task 293073451048767931 started by @edithatogo

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[amazon-q-developer]

This PR successfully addresses the security concern by adding a 10-second timeout to urllib.request.urlopen calls, preventing indefinite hanging and potential DoS/resource exhaustion scenarios. The implementation is correct and includes appropriate test coverage for timeout exception handling.

Key Changes:

• Added TIMEOUT_SECONDS constant (10 seconds)
• Applied timeout parameter to urlopen call in fetch_url
• Added unit test verifying timeout exceptions are gracefully handled

The changes are ready to merge.

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