tools: remove non-existing file from CODEOWNERS file

Signed-off-by: Juan José Arboleda <soyjuanarbol@gmail.com>
PR-URL: nodejs#48697
Reviewed-By: Ruy Adorno <ruyadorno@google.com>
Reviewed-By: Danielle Adams <adamzdanielle@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>

.github/CODEOWNERS

@@ -159,7 +159,6 @@
 
 # Permission Model
 /doc/api/permissions.md @nodejs/security-wg
-/lib/internal/process/permission.js @nodejs/security-wg
 /src/permission/* @nodejs/security-wg
 
 # Dependency Update Tools