Fix Dependabot security alerts — update vulnerable dependencies

[FernandoCelmer]

Description

27 open Dependabot security alerts across 4 packages with pinned outdated versions in multiple requirements.txt files.

Vulnerable Packages

Package	Current	Fixed	Severity	Alerts
h11	0.14.0	0.16.0	Critical	Malformed Chunked-Encoding body acceptance
urllib3	2.3.0–2.4.0	2.6.3	High	Decompression bombs, unbounded decompression chain, redirect issues
requests	2.32.3	2.33.1	Medium	Insecure temp file reuse, .netrc credential leak
Pygments	2.19.1	2.20.0	Low	ReDoS via GUID matching regex

Affected Files

• requirements.txt (root)
• etl_flow/requirements.txt
• health_check_flow/requirements.txt
• server_flow/requirements.txt

Fix

Update all pinned versions to latest patched releases across all requirements files.

Priority

Critical (h11 vuln allows malformed HTTP request processing)