update sbml from Spack v0.20.0 upstream

packages/sbml/package.py

-# this package was adapted from Spack upstream v0.19.2, to fix some issues with finding existing libs/headers
+# this package was adapted from Spack upstream v0.20.0, to fix some issues with finding existing libs/headers
 
-# Copyright 2013-2022 Lawrence Livermore National Security, LLC and other
+# 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)
@@ -12,7 +12,7 @@ class Sbml(CMakePackage):
     """Library for the Systems Biology Markup Language"""
 
     homepage = "https://sbml.org"
-    maintainers = ["rblake-llnl"]
+    maintainers("rblake-llnl")
 
     version("5.19.0", sha256="a7f0e18be78ff0e064e4cdb1cd86634d08bc33be5250db4a1878bd81eeb8b547")
     version("5.18.0", sha256="6c01be2306ec0c9656b59cb082eb7b90176c39506dd0f912b02e08298a553360")
@@ -87,10 +87,7 @@ class Sbml(CMakePackage):
         args.append(self.define_from_variant("WITH_CPP_NAMESPACE", "cpp"))
         if "+python" in spec:
             args.extend(
-                [
-                    "-DWITH_PYTHON:BOOL=ON",
-                    "-DWITH_PYTHON_INCLUDE:PATH=%s" % spec["python"].prefix,
-                ]
+                ["-DWITH_PYTHON:BOOL=ON", "-DWITH_PYTHON_INCLUDE:PATH=%s" % spec["python"].prefix]
             )
         else:
             args.append("-DWITH_PYTHON:BOOL=OFF")