fix: specify diffsptk version

yoyolicoris · web-flow · commit 231ba5600b17 · 2025-07-01T05:24:40.000+08:00
diff --git a/requirements.txt b/requirements.txt
@@ -9,4 +9,4 @@ docutils==0.17.1
 scikit-fem
 control
 PySoundFile
-diffsptk
+diffsptk<2.0
