pyproject.toml: loosen dependencies to avoid building from source

pyproject.toml

@@ -1,5 +1,11 @@
 [build-system]
-requires = ["setuptools", "wheel", "cython==0.29.30", "numpy==1.22.0", "packaging"]
+requires = [
+    "setuptools",
+    "wheel",
+    "cython~=0.29.30",
+    "numpy>=1.22.0",
+    "packaging",
+]
 
 [flake8]
 max-line-length=120