Remove unneccessary access token from update workflow

It is not necessary to use a PAT to check out a public repository. Because it is defined, the PAT eventually will expire and the action will stop working. By leaving it at default, the workflow generates a new Github token every time it runs which is enough to check out the repo.

.github/workflows/update.yml

@@ -13,8 +13,6 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v5
-        with:
-          token: ${{ secrets.REPO_TOKEN }}
 
       - name: Run update script
         run: ./update.sh