[CVE] Update Pygement to counter CVE-2026-4539 - severity 3.3 (low)

Pygments is a syntax highlighter. The CVE consists of an inefficient
regular expression complexity in a denial for service attack, and
requires local access.

Source: https://nvd.nist.gov/vuln/detail/CVE-2026-4539

Author: gkaf89

requirements.txt

@@ -29,7 +29,7 @@ mdx-truly-sane-lists==1.3
 nltk==3.9.4
 pandas==2.3.3
 pep562==1.1
-Pygments==2.19.2
+Pygments==2.20.0
 pymdown-extensions==10.20
 python-dateutil==2.9.0.post0
 pytz==2025.2