chore: update CODEOWNERS username mvayngrib -> exo-mv (#71)

Author: mvayngrib

.github/CODEOWNERS

@@ -1,3 +1,3 @@
-/.github/ @633kh4ck @mvayngrib
+/.github/ @633kh4ck @exo-mv
 /.github/*.md
-/.github/SECURITY.md @633kh4ck @mvayngrib
+/.github/SECURITY.md @633kh4ck @exo-mv