bin/post_version.py: Make the git commit as well.

Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Juan A. Suarez <jasuarez@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/2505>

bin/post_version_test.py

@@ -27,6 +27,8 @@ import pytest
 from . import post_version
 
 
+# Mock out subprocess.run to avoid having git commits
+@mock.patch('bin.post_version.subprocess.run', mock.Mock())
 class TestUpdateCalendar:
 
     HEAD = textwrap.dedent("""\