codeowners: add rule for *.gypi files

PR-URL: https://github.com/nodejs/node/pull/20740
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

.github/CODEOWNERS

@@ -56,6 +56,7 @@
 *.md @nodejs/documentation
 *.py @nodejs/python
 *.gyp @nodejs/gyp
+*.gypi @nodejs/gyp
 
 Makefile @nodejs/build
 vcbuild.bat @nodejs/build