Fix checkout auth in self-hosted build workflow

Co-authored-by: josef-poetzl <115746022+josef-poetzl@users.noreply.github.com>

Author: Copilot

.github/workflows/Build-self-hosted.yml

@@ -3,6 +3,7 @@ on:
   - workflow_dispatch
 
 permissions:
+  contents: read
   id-token: write
   attestations: write
 
@@ -12,8 +13,6 @@ jobs:
     steps:
       - name: "Checkout"
         uses: actions/checkout@v4
-        with:
-          token: ${{ secrets.ACCESS_TOKEN }} 
       - name: "Build Access file (accdb/accde)"
         id: build_access_file
         uses: AccessCodeLib/msaccess-vcs-build@main