Fix source folder path

Author: marwhals

.github/workflows/latex.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Compile LaTeX
         uses: xu-cheng/latex-action@v2
         with:
-          root_file: main.tex
+          root_file: src/main.tex
 
       - name: Upload PDF
         uses: actions/upload-artifact@v4