[add] py-cssutils: new package (#40551)

Co-authored-by: LydDeb <lyderic.debusschere@eolen.com>

var/spack/repos/builtin/packages/py-cssutils/package.py

@@ -0,0 +1,21 @@
+# Copyright 2013-2023 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack.package import *
+
+
+class PyCssutils(PythonPackage):
+    """A CSS Cascading Style Sheets library for Python."""
+
+    homepage = "https://github.com/jaraco/cssutils"
+    pypi = "cssutils/cssutils-2.7.1.tar.gz"
+
+    maintainers("LydDeb")
+
+    version("2.7.1", sha256="340ecfd9835d21df8f98500f0dfcea0aee41cb4e19ecbc2cf94f0a6d36d7cb6c")
+
+    depends_on("py-setuptools@56:", type="build")
+    depends_on("py-setuptools-scm@3.4.1:+toml", type="build")
+    depends_on("py-importlib-metadata", type=("build", "run"), when="^python@:3.7")