ci: remove systemdlint

.gitea/workflows/ci.yaml

@@ -11,12 +11,6 @@ jobs:
     steps:
       - name: Git checkout
         uses: actions/checkout@v6
-      - name: Setup python
-        uses: actions/setup-python@v6
-      - name: Install systemdlint
-        run: pip install systemdlint
-      - name: Lint systemd files
-        run: systemdlint files/systemd/certbot-renew.service files/systemd/certbot-renew.timer
       - name: Lint shell scripts
         run: shellcheck files/sbin/certbot-renew
       - name: Build tarball