PEP 770: Improving measurability of Python packages with Software Bill-of-Materials (#4187)

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

Author: sethmlarson

.github/CODEOWNERS

@@ -646,6 +646,7 @@ peps/pep-0765.rst  @iritkatriel @ncoghlan
 peps/pep-0766.rst  @warsaw
 peps/pep-0767.rst  @carljm
 peps/pep-0768.rst  @pablogsal
+peps/pep-0770.rst  @sethmlarson @brettcannon
 # ...
 peps/pep-0777.rst  @warsaw
 # ...