PEP 809: Stable ABI for the Future (#4599)

Author: zooba

.github/CODEOWNERS

@@ -684,6 +684,8 @@ peps/pep-0804.rst  @pradyunsg
 peps/pep-0806.rst  @JelleZijlstra
 peps/pep-0807.rst  @dstufft
 # ...
+peps/pep-0809.rst  @zooba
+# ...
 peps/pep-2026.rst  @hugovk
 # ...
 peps/pep-3000.rst  @gvanrossum