Merge pull request #143 from LDMX-Software/dependabot/github_actions/actions/upload-pages-artifact-4

Bump actions/upload-pages-artifact from 3 to 4

Author: tvami

.github/workflows/mdbook.yml

@@ -54,7 +54,7 @@ jobs:
             --root-dir "${{ github.workspace }}/docs/book"
             ./docs/book
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: ./docs/book