chore: do not copy dependabot yml to target repos

Author: galargh

.github/workflows/upgrade_reusable.yml

@@ -45,7 +45,7 @@ jobs:
           token: ${{ steps.token.outputs.token }}
       - name: Copy files from the template
         run: |
-          for file in $(git ls-files ':!:github/*.yml' ':!:scripts/src/actions/fix-yaml-config.ts' ':!:terraform/*_override.tf' ':!:.github/workflows/*_reusable.yml' ':!:README.md'); do
+          for file in $(git ls-files ':!:github/*.yml' ':!:scripts/src/actions/fix-yaml-config.ts' ':!:terraform/*_override.tf' ':!:.github/dependabot.yml' ':!:.github/workflows/*_reusable.yml' ':!:README.md'); do
             mkdir -p "../github-mgmt/$(dirname "${file}")"
             cp -f "${file}" "../github-mgmt/${file}"
           done