meta: fix dependabot commit message

PR-URL: https://github.com/nodejs/node/pull/47810
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>

.github/dependabot.yml

@@ -6,4 +6,6 @@ updates:
     directory: /
     schedule:
       interval: monthly
+    commit-message:
+      prefix: meta
     open-pull-requests-limit: 10