Make sure to update, upgrate and autoremove before latex installation (#696)

This is due to the Failed to fetch error, which (according to
[this](https://askubuntu.com/questions/1241009/failed-to-fetch-installation-errors))
is caused by outdated repository information.

Author: alongd

.github/workflows/gh-pages.yml

@@ -33,6 +33,7 @@ jobs:
 
     - name: Install LaTeX
       run: |
+        sudo apt update -y && sudo apt upgrade -y && sudo apt autoremove -y
         sudo apt install texlive-latex-base -y
         sudo apt-get install texlive-latex-extra -y
         sudo apt-get install -y dvipng