.github/workflows: Use configurable secret for AssignReviewers

Signed-off-by: Michael D Kinney <[email protected]>

Author: mdkinney

.github/workflows/AssignReviewers.yml

@@ -22,4 +22,4 @@ jobs:
         uses: actions/checkout@v2
       - uses: mdkinney/github-action-assign-reviewers@main
         with:
-          token: ${{secrets.GITHUB_TOKEN}}
+          token: ${{secrets.CODEOWNERS_VALIDATOR_TOKEN}}