Fix CI

Author: nickevansuk

.github/workflows/create-data-model-pr.yaml

@@ -46,7 +46,7 @@ jobs:
         # - The dataset-site-template version number updating within the template in DatasetSiteMustacheTemplate.cs (affects one line)
         # - Any updates to the package.json or package-lock.json files in OpenActive.DatasetSite.NET.Generator (not worth creating a PR JUST for these if the new version did not have any implications)
         # git stashing if no material changes allows the next step to close the PR if one is already open
-        run: if [ "$(git diff --numstat | grep -vc '^1\t.*DatasetSiteMustacheTemplate\.cs\|.*package\.json\|.*package-lock\.json$')" -eq "0" ]; then git stash; else echo "Material changes found"; fi
+        run: if [ "$(git diff --numstat | grep -vc '^1\\t.*DatasetSiteMustacheTemplate\.cs\|.*package\.json\|.*package-lock\.json$')" -eq "0" ]; then git stash; else echo "Material changes found"; fi
         working-directory: ./
 
       - name: Create Pull Request