chore(deps): update xu-cheng/latex-action action to v4

Author: renovate[bot]

.github/workflows/tex.yml

@@ -7,7 +7,7 @@ jobs:
       - name: Set up Git repository
         uses: actions/checkout@v4
       - name: Compile LaTeX document
-        uses: xu-cheng/latex-action@v3
+        uses: xu-cheng/latex-action@v4
         with:
           root_file: Paper.tex
       - name: Upload PDF file