chore: enable listings code highlighter

Author: rjaegers

.github/workflows/wc-document-generation.yml

@@ -29,7 +29,7 @@ jobs:
           sbdl -m template-fill --template docs/templates/requirements.md.j2 output.sbdl > requirements.md
       - uses: docker://pandoc/extra:3.7.0@sha256:a703d335fa237f8fc3303329d87e2555dca5187930da38bfa9010fa4e690933a
         with:
-          args: --template eisvogel --output requirements.pdf requirements.md
+          args: --template eisvogel --listings --output requirements.pdf requirements.md
       - uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
         with:
           name: documents