fix: Update dev dependencies for lxml | NPG-0000 (#514)

# Description

Updates earthly build step for ideascale-importer to include lxml system
dependencies.

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)

**List of new dependencies**: libxslt-dev libxml2-dev lib32z1-dev



## Checklist

- [X] My code follows the style guidelines of this project
- [X] I have performed a self-review of my code

utilities/ideascale-importer/Earthfile

@@ -12,7 +12,7 @@ build:
 
     # Install system dependencies
     RUN apt-get update && \
-        apt-get install -y --no-install-recommends curl
+        apt-get install -y --no-install-recommends curl build-essential libxml2-dev libxslt-dev lib32z1-dev python3-lxml
 
     # Install Poetry
     RUN curl -sSL https://install.python-poetry.org | python3 -