ci: revert to Github token

Author: JesperDramsch

.github/workflows/check-conference-update.yml

@@ -641,11 +641,11 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-          token: ${{ secrets.GH_PAT }}
+          token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Configure git
         env:
-          GITHUB_TOKEN: ${{ secrets.GH_PAT }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           git config user.name "github-actions[bot]"
           git config user.email "github-actions[bot]@users.noreply.github.com"
@@ -853,11 +853,11 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-          token: ${{ secrets.GH_PAT }}
+          token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Configure git
         env:
-          GITHUB_TOKEN: ${{ secrets.GH_PAT }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           git config user.name "github-actions[bot]"
           git config user.email "github-actions[bot]@users.noreply.github.com"