update: update fast-langdetect to 0.2.1

requirements.txt

@@ -4,7 +4,7 @@ click>=8.1.7
 PyMuPDF>=1.24.7
 loguru>=0.6.0
 numpy>=1.21.6, <2.0.0 #2.0版本与fasttext不兼容
-fast-langdetect>=0.2.0
+fast-langdetect>=0.2.1
 wordninja>=2.0.0
 scikit-learn>=1.0.2
 pdfminer.six>=20231228