pyproject.toml: clarify build system version (#222)

adamjstewart · blink1073 · web-flow · commit ea75fc04f9a4 · 2021-12-13T06:53:12.000-06:00
Co-authored-by: Steven Silvester &lt;steven.silvester@ieee.org&gt;
diff --git a/pyproject.toml b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["jupyter_packaging~=0.9,<2", "jupyter_server"]
+requires = ["jupyter_packaging>0.9,<2", "jupyter_server"]
 build-backend = "setuptools.build_meta"
 
 [tool.jupyter-releaser]
