Fix CODEOWNERS typo

Author: StanFromIreland

.github/CODEOWNERS

@@ -679,7 +679,7 @@ peps/pep-0800.rst  @JelleZijlstra
 peps/pep-0801.rst  @warsaw
 peps/pep-0802.rst  @AA-Turner
 peps/pep-0803.rst  @encukou
-peps/pep-0806.rst  @ezio-melotti
+peps/pep-0807.rst  @ezio-melotti
 # ...
 peps/pep-2026.rst  @hugovk
 # ...