Update nbclassic requirement from <0.4.0 to <0.5.0

Updates the requirements on [nbclassic](http://jupyter.org) to permit the latest version.

---
updated-dependencies:
- dependency-name: nbclassic
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -40,7 +40,7 @@ dependencies = [
     "jupyterlab<4",
     "jupyterlab_server",
     "MarkupSafe<2.2.0",
-    "nbclassic<0.4.0",
+    "nbclassic<0.5.0",
     "nbclient>=0.6.1",
     "nbconvert>=6",
     "notebook>=6.4,<7",