Revert "Update smithy-rs to release-2025-07-08 (#1315)" (#1316)

This reverts commit 3068501 to avoid
MRSV bump failure encountered in release
```
error: rustc 1.85.0 is not supported by the following package:
  [email protected] requires rustc 1.86.0
```

Author: ysaito1001

config.json

@@ -1,5 +1,5 @@
 {
   "dependencies": {
-    "smithyRsVersion": "release-2025-07-08"
+    "smithyRsVersion": "release-2025-06-30"
   }
 }