remove dco workflow (#2936)

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

.github/workflows/dco.yaml

@@ -1,23 +0,0 @@
-name: DCO
-on:
-  pull_request:
-  push:
-    branches:
-      - main
-jobs:
-  DCO:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Setup Python 3.x
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.x'
-
-      - name: Check DCO
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          pip3 install -U dco-check
-          dco-check --verbose --exclude-pattern 'dependabot\[bot\]@users\.noreply\.github\.com'