⬆️ chore(deps): upgrade all dependencies to latest versions

PyMuPDF >=1.23.0 -> >=1.28.0 (resolves to 1.28.0, MuPDF 1.29.0).
This is the only runtime dependency; there are no transitive deps.

No code changes were required. The extractors use a small, stable slice
of the API (fitz.open, page.get_text, page.find_tables, page.number,
doc.close, Document indexing/slicing), all unchanged across 1.23 -> 1.28.
The `import fitz` alias still works on 1.28.

Verified by re-running both PDF extractors against the committed source
PDFs and diffing the output: extracted_cnssi_1253.json (1189 controls)
and extracted_classified_information.json are byte-identical to the
JSON already in the repo.

Also gitignores .venv so the local uv environment is never committed.

Author: luiscosio

.gitignore

@@ -1,2 +1,3 @@
 .DS_Store
-__pycache__
+__pycache__
+.venv

requirements.txt

@@ -1,3 +1,3 @@
 # PDF extraction dependencies
-PyMuPDF>=1.23.0
+PyMuPDF>=1.28.0