Add flag to skip checking dev deps

Author: catalinsymphony

.github/workflows/security.yml

@@ -47,7 +47,7 @@ jobs:
         run: poetry install
 
       - name: Export dependencies
-        run: poetry export -o requirements.txt
+        run: poetry export -o requirements.txt --only main
 
       - name: Run license checks
         run: poetry run liccheck