fix(dev-docker): ignore .python-version inside the container

It should use Python installed in the container and not attempt to use
something else.

Fixes WeblateOrg#13326

dev-docker/weblate-dev/start-dev

@@ -9,18 +9,18 @@ set -e
 cd /app/src
 
 echo "Exporting Weblate requirements..."
-uv export --format requirements-txt --python /usr/local/bin/python --all-extras --no-sources > /tmp/requirements.txt
+uv export --no-config --format requirements-txt --python /usr/local/bin/python --all-extras --no-sources > /tmp/requirements.txt
 
 echo "Checking /app/venv..."
 if [ ! -f /app/venv/bin/activate ]; then
-    uv venv /app/venv
+    uv venv --no-config /app/venv
 fi
 echo "/app/data/python" > "/app/venv/lib/python${PYVERSION}/site-packages/weblate-docker.pth"
 # shellcheck disable=SC1091
 . /app/venv/bin/activate
 
 echo "Installing Weblate requirements..."
-uv pip install -r /tmp/requirements.txt
+uv pip install --no-config -r /tmp/requirements.txt
 
 echo "Starting Weblate..."
 exec /app/bin/start "$@"