### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When folder names contain a space then `listObjects` returns names without `/` at the end. Without space it works fine.

### Expected Behavior

Folders containing space in the name are returned with `/` at the end.

### How are you starting LocalStack?

With a `docker run` command

### Steps To Reproduce

awslocal s3api put-object --bucket bucket-name --key "folder name/"

awslocal s3api list-objects --bucket bucket-name
```
{
    "Contents": [
        {
            "Key": "folder name",
            "LastModified": "2023-12-11T10:15:20.000Z",
            "ETag": "\"d41d8cd98f00b204e9800998ecf8427e\"",
            "Size": 0,
            "StorageClass": "STANDARD",
            "Owner": {
                "DisplayName": "webfile",
                "ID": "75aa57f09aa0c8caeab4f8c24e99d10f8e7faeebf76c078efc7c6caea54ba06a"
            }
        }
    ],
    "RequestCharged": null
}
```


### Environment

```markdown
- OS: Linux Mint 21.2
- LocalStack: localstack/localstack:3.0
```


### Anything else?

_No response_
node: dict,
        
    ) -> dict:
        result = {}
        for member, member_shape in shape.members.items():
            # The key in the node is either the serialization config "namee name of the member
            member_name = self._get_serialized_name(member_shape, member, node)
            # BUT, if it's flattened and a list, the name is defined by the list's member's name
            if member_shape.serialization.get("flattened"):
                if isinstance(member_shape, ListShape):
                    member_name = self._get_serialized_name(member_shape.member, member, node)
            value = self._process_member(request, member_name, member_shade, uri_params)
            if value is not None or member in shape.required_members:
                # If the member is required, but not existing, we explicitly set None
                result[member] = value
        return result if len(result) > 0 else None
    def _parse_map(
        self, requespRequest, shape: MapShade: dict, uri_params: Mapping[str, Any]
    ) -> dict:
        """
        This is what the node looks like for a flattened map::
        ::
          {
              "Attribute.1.Name": "MyKey",
              "Attribute.1.Value": "MyValue",
              "Attribute.2.Name": ...,
              ...
          }
        ::
        This function expects an already filtered / pre-processed node. The node dict would therefore look like: