fix: patch Snyk vulnerabilities in pip, setuptools, and black

[OMpawar-21]

Summary

• Upgraded pip to >=26.1.2 to fix Arbitrary File Upload, Arbitrary Code Injection, and Directory Traversal vulnerabilities
• Upgraded setuptools to >=83.0.0 to fix Improper Unicode Encoding Handling vulnerability
• Upgraded black to >=26.3.1 to fix a high-severity Directory Traversal vulnerability
• Bumped SDK version to 1.6.1 and updated CHANGELOG.md

Test plan

• pip install -r requirements.txt --upgrade
• pytest --html=tests/report/test-report.html passes
• snyk test no longer reports the black/pip/setuptools vulnerabilities

🤖 Generated with Claude Code

[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	0	0	25	✅ Passed
🟡 Medium Severity	0	3	500	✅ Passed
🔵 Low Severity	0	0	1000	✅ Passed

⏱️ SLA Breach Summary

✅ No SLA breaches detected. All vulnerabilities are within acceptable time thresholds.

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	0	30 / 120 days	✅ Passed
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

ℹ️ Vulnerabilities Without Available Fixes (Informational Only)

The following vulnerabilities were detected but do not have fixes available (no upgrade or patch). These are excluded from failure thresholds:

• Critical without fixes: 0
• High without fixes: 0
• Medium without fixes: 3
• Low without fixes: 0

✅ BUILD PASSED - All security checks passed