Update to 0.21 and drop the patch in favor of a sed.

python-Levenshtein.spec

@@ -1,7 +1,7 @@
 %global srcname Levenshtein
 
 %global forgeurl https://github.com/maxbachmann/%{srcname}
-Version:        0.20.8
+Version:        0.21.0
 %forgemeta
 
 Name:         python-%{srcname}
@@ -15,7 +15,6 @@ License:      GPL-2.0-or-later
 URL:          %{forgeurl}
 
 Source0:      %{forgesource}
-Patch0:       levenshtein-0.20.8-cython-0.29.patch
 
 BuildRequires: cmake
 BuildRequires: gcc
@@ -37,7 +36,9 @@ Summary:  %{summary}
 %description -n python3-%{srcname} %_description
 
 %prep
-%autosetup -p1 -n %{srcname}-%{version}
+%autosetup -n %{srcname}-%{version}
+# Levenshtein can build under older Cython successfully
+sed 's/Cython>=3.0.0[ab0-9]\+/Cython>=0.29.26/' -i pyproject.toml
 
 %generate_buildrequires
 %pyproject_buildrequires