build: limit update authors CI scope

PR-URL: #40219
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Zijian Liu <[email protected]>
Reviewed-By: Qingyu Deng <[email protected]>
Reviewed-By: Darshan Sen <[email protected]>
Reviewed-By: Rich Trott <[email protected]>

.github/workflows/authors.yml

@@ -8,6 +8,7 @@ on:
 
 jobs:
   authors_update:
+    if: github.repository == 'nodejs/node'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2