fix(deps): lock numpy<2 because 2.0.0 is coming and has breaking changes

See: https://pythonspeed.com/articles/numpy-2

When numpy 2.0.0 is actually out, we'll want to test g2p and our other projects
against it before allowing it.

requirements.min.txt

@@ -9,7 +9,7 @@ g2p>=1.1.20230822, <2.1
 httpx>=0.24.1
 lxml==4.9.1
 networkx>=2.6
-numpy>=1.16.4
+numpy>=1.20.2,<2
 pydub==0.23.1
 pympi-ling>=1.69,<2.0
 python-slugify==5.0.0