fix: add python-readability to test requirements

libs/community/extended_testing_deps.txt

@@ -70,6 +70,7 @@ pymupdf>=1.22.3,<2
 pypdf>=3.4.0,<5
 pypdfium2>=4.10.0,<5
 pyspark>=3.4.0,<4
+python-readability>=0.1.2
 rank-bm25>=0.2.2,<0.3
 rapidfuzz>=3.1.1,<4
 rapidocr-onnxruntime>=1.3.2,<2