PEP 641: Use an underscore in the version portion of Python 3.10 compatibility tag

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1891840
Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1899553

python-packaging.spec

@@ -8,7 +8,7 @@
 
 Name:           python-%{pypi_name}
 Version:        20.4
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Core utilities for Python packages
 
 License:        BSD or ASL 2.0
@@ -19,6 +19,9 @@ BuildArch:      noarch
 # Remove dependency on six to make package lighter, backported from upstream
 Patch1:         %{url}/commit/39a70cce.patch
 
+# PEP 641: Use an underscore in the version portion of Python 3.10 compatibility tag
+Patch2:         %{url}/pull/354.patch
+
 BuildRequires:  python%{python3_pkgversion}-devel
 BuildRequires:  pyproject-rpm-macros
 
@@ -108,6 +111,11 @@ rm -rf html/_static/fonts/
 
 
 %changelog
+* Tue Nov 24 2020 Miro Hrončok <mhroncok@redhat.com> - 20.4-4
+- PEP 641: Use an underscore in the version portion of Python 3.10 compatibility tag
+- Resolves: rhbz#1891840
+- Resolves: rhbz#1899553
+
 * Fri Oct 02 2020 Miro Hrončok <mhroncok@redhat.com> - 20.4-3
 - Drop the dependency on six to make the package lighter