Update shapely requirement from >=2.0.0 to >=2.1.2

Updates the requirements on [shapely](https://github.com/shapely/shapely) to permit the latest version.
- [Release notes](https://github.com/shapely/shapely/releases)
- [Changelog](https://github.com/shapely/shapely/blob/main/CHANGES.txt)
- [Commits](shapely/shapely@2.0.0...2.1.2)

---
updated-dependencies:
- dependency-name: shapely
  dependency-version: 2.1.2
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements/base.txt

@@ -51,7 +51,7 @@ pytesseract
 pydantic-ai>=1.56.0,<2
 spacy
 pdfplumber>=0.10.0  # https://github.com/jsvine/pdfplumber - PDF token extraction
-shapely>=2.0.0  # https://github.com/shapely/shapely - spatial operations for bbox intersection
+shapely>=2.1.2  # https://github.com/shapely/shapely - spatial operations for bbox intersection
 
 # Data Processing Tools
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