meta: add @nodejs/actions as CODEOWNERS

PR-URL: #39119
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>

Author: mmarchini

.github/CODEOWNERS

@@ -119,3 +119,8 @@
 # V8
 /deps/v8/* @nodejs/v8-update
 /tools/v8_gypfiles/* @nodejs/v8-update
+
+# Actions
+
+/.github/workflows/* @nodejs/actions
+/tools/actions/* @nodejs/actions