Revert "Exclude incompatible Sphinx releases (#711)"

This reverts commit 4dd6eec. These are
now compatible with Furo.

Author: pradyunsg

pyproject.toml

@@ -17,7 +17,7 @@ readme = "README.md"
 requires-python = ">=3.8"
 dependencies = [
   "beautifulsoup4",
-  "sphinx >= 6.0,<8.0,!=7.2.0,!=7.2.1",
+  "sphinx >= 6.0,<8.0",
   "sphinx-basic-ng",
   "pygments >= 2.7",
 ]