Update Stockfish 11 download URLs (fixes #1019)

Author: niklasf

.github/workflows/setup-ubuntu-latest.sh

@@ -1,7 +1,7 @@
 #!/bin/sh -e
 
 # Stockfish
-wget https://stockfish.s3.amazonaws.com/stockfish-11-linux.zip
+wget https://files.stockfishchess.org/archive/Stockfish%2011/stockfish-11-linux.zip
 unzip stockfish-11-linux.zip
 mkdir -p bin
 cp stockfish-11-linux/Linux/stockfish_20011801_x64_bmi2 bin/stockfish

.github/workflows/setup-windows-latest.sh

@@ -2,7 +2,7 @@
 
 echo Download ...
 choco install wget
-wget https://stockfishchess.org/files/stockfish-11-win.zip
+wget https://files.stockfishchess.org/archive/Stockfish%2011/stockfish-11-win.zip
 
 echo Unzip ..
 7z e stockfish-11-win.zip stockfish-11-win/Windows/*.exe