fix(rundev): update base docker image automatically

Otherwise user is stick with the image downloaded when first starting
with Weblate.

Fixes #11925

rundev.sh

@@ -25,6 +25,8 @@ build() {
     mkdir -p data
     # Build single requirements file
     sed -n 's/^  "\([][a-zA-Z._0-9-]\+[<>=].*\)".*/\1/p' ../pyproject.toml > weblate-dev/requirements.txt
+    # Fetch up-to-date base docker image
+    docker pull weblate/weblate:bleeding
     # Build the container
     docker compose build --build-arg USER_ID="$(id -u)" --build-arg GROUP_ID="$(id -g)"