ci: remove retention days (tsukinaha#405)

revert to default 90 days retention.

Author: Kosette

.github/workflows/build_windows.yml

@@ -162,5 +162,5 @@ jobs:
             artifact/*.7z
             artifact/*.sha512sum
           compression-level: 0
-          retention-days: 3
-          if-no-files-found: error
+          if-no-files-found: error
+