Make numpy a direct dependency of Norfair.

Author: facundo-lezama

poetry.lock

@@ -40,6 +40,10 @@ python = "^3.6.1"
 filterpy = "^1.4.5"
 rich = ">=9.10.0, <13.0.0"
 scipy = ">=1.5.4"
+numpy = [
+    {version = "^1.19.0", python = "<3.8"},
+    {version = "^1.23.0", python = ">=3.8"}
+]
 opencv-python = { version = ">= 3.2.0, < 5.0.0", optional = true }
 motmetrics = { version = "1.2.5", optional = true }
 importlib-metadata = { version = "4.8.3", python = "<3.8" }