fix(sissue_router): migrate to GraphQL work items API

# pipdeptree --warn silence  -f > requirements.txt

# Regenerate (matching the CI python:3.12 image) with:

#   uv venv --python 3.12 && uv pip install "python-gitlab[graphql]==6.2.0" click==8.2.1 && uv pip freeze

# The [graphql] extra is required: the router uses the GraphQL work items API so

# it can see custom work item types (e.g. "Request For Help") that the REST

# issues API does not return.

anyio==4.14.1

backoff==2.2.1

certifi==2026.6.17

charset-normalizer==3.4.9

click==8.2.1

python-dateutil==2.9.0.post0

  six==1.17.0

gql==3.5.3

graphql-core==3.2.6

h11==0.16.0

httpcore==1.0.9

httpx==0.28.1

idna==3.18

multidict==6.7.1

propcache==0.5.2

python-gitlab==6.2.0

  requests==2.32.4

    charset-normalizer==3.4.2

    idna==3.10

    urllib3==2.5.0

    certifi==2025.7.14

requests==2.34.2

requests-toolbelt==1.0.0

    requests==2.32.4

      charset-normalizer==3.4.2

      idna==3.10

      urllib3==2.5.0

      certifi==2025.7.14

typing-extensions==4.16.0

urllib3==2.7.0

yarl==1.24.2