fix: retry xlings install mcpp with explicit version on failure

Author: Sunrisepeak

.github/workflows/ci-windows.yml

@@ -56,7 +56,11 @@ jobs:
           export PATH="$USERPROFILE/.xlings/subos/default/bin:$PATH"
           echo "$USERPROFILE/.xlings/subos/default/bin" >> "$GITHUB_PATH"
           xlings.exe --version
-          xlings.exe install mcpp -y
+          xlings.exe install mcpp -y || {
+            echo "::error::xlings install mcpp failed"
+            echo "Retrying with explicit version..."
+            xlings.exe install mcpp@0.0.17 -y
+          }
           MCPP="$USERPROFILE/.xlings/subos/default/bin/mcpp.exe"
           test -f "$MCPP" || MCPP="$USERPROFILE/.xlings/subos/default/bin/mcpp"
           test -f "$MCPP"