Use the PAT for pushing changes correctly

Using action/checkout with token is broken for our usecase, implemented
a workaround from:

actions/checkout#664 (comment)

Author: simonswine

.github/workflows/update-contributors.yml

@@ -10,15 +10,15 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-        with:
-          # these are credentials for https://github.com/pyroscopebot
-          token: ${{ secrets.BOT_GITHUB_TOKEN }}
       - uses: actions/setup-go@v5
         with:
           go-version: '1.22'
       - name: Update contributors
         run: make update-contributors
 
+      - name: Update git credentials
+        run: git remote set-url origin https://x-access-token:${{ secrets.BOT_GITHUB_TOKEN }}@github.com/${{ github.repository }}
+
       - uses: stefanzweifel/git-auto-commit-action@v5
         with:
           commit_user_name: Pyroscope Bot