fix: use stable upload for beyondfossifuels coal db (#280)

Author: lkstrp

powerplantmatching/package_data/config.yaml

@@ -73,7 +73,7 @@ BEYONDCOAL:
   reliability_score: 4
   status: ["construction", "operational", "no longer coal", "retired", "standby", "deactivated", "retrofitting"]
   fn: 2025-07-24-BeyondFossilFuels-Europe_Coal_Plants_Database.xlsx
-  url: https://beyondfossilfuels.org/wp-content/uploads/2025/07/2025-07-24-BeyondFossilFuels-Europe_Coal_Plants_Database.xlsx
+  url: https://tubcloud.tu-berlin.de/s/bw7tbpo6A3qXYDz/download/2025-07-24-BeyondFossilFuels-Europe_Coal_Plants_Database.xlsx
 IRENA:
   net_capacity: true
   aggregated_units: true