🔒 Prevent API key exposure in Census extractor error logs

[Data-Science-Link]

🎯 What: Modified census_extractor.py to securely redact the Census API key from any exception strings before logging them, and reformatted the file with black.

⚠️ Risk: The previous behavior would catch all requests exceptions and log the stringified error which, for requests.HTTPError on a 4xx response, would include the fully-constructed URL including the API key in plaintext. This creates a data exposure vulnerability, leaking secrets into logs or CI/CD pipelines.

🛡️ Solution: Added a _redact helper method in CensusExtractor that safely replaces occurrences of self.api_key with ***REDACTED*** in error message strings before they are sent to the logger. Wrapped all 4 exception logging blocks with this redaction layer.

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PR created automatically by Jules for task 12606068584406796596 started by @Data-Science-Link

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[github-actions]

🔒 Security Scan Complete

Code Security: ✅ Checked with Bandit
Dependencies: ✅ Checked with pip-audit

All security checks passed! See Actions logs for details.