Try to provide explicit token

Cannot checkout with `act` on windows

Author: award999

.github/workflows/swift_package_test.yml

@@ -108,7 +108,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
-          ref: ${{ github.ref }}  # Include changes to the target branch when action is re-run https://github.com/actions/checkout/issues/1036
+          # ref: ${{ github.ref }}  # Include changes to the target branch when action is re-run https://github.com/actions/checkout/issues/1036=
       - name: Set environment variables
         if: ${{ inputs.windows_env_vars }}
         run: |