Fix Dependabot actor check in node-ci.yml workflow

The `if` condition used `'dependabot'` but Dependabot's actual GitHub
actor username is `'dependabot[bot]'`. This caused the test job to run
for Dependabot PRs when it should be skipped, resulting in npm install
failures due to ESLint 10 peer dependency conflicts.

Co-authored-by: decyjphr <57544838+decyjphr@users.noreply.github.com>

Author: Copilot

.github/workflows/node-ci.yml

@@ -11,7 +11,7 @@ concurrency:
 
 jobs:
   test:
-    if: ${{ github.actor != 'dependabot'}}
+    if: ${{ github.actor != 'dependabot[bot]'}}
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6