"UnicodeEncodeError: 'latin-1' codec can't encode character, ordinal not in range" on GCS upload_object_via_stream

## Summary

I'm trying to upload some CSV files to GCS using libcloud, today I this error:

```log
UnicodeEncodeError: 'latin-1' codec can't encode character '\u201c' in position 628: ordinal not in range(256)
```

## Detailed Information

The encode character and position change with each run, even though the files don't change. I'm not sure what's causing that, CSV files are basically plaintext.

Here's the full stack (some internal code ommitted):

```log
Traceback (most recent call last):
[...]
self.__container.upload_object_via_stream(stream, name) # type: ignore
File "/usr/local/lib/python3.8/site-packages/libcloud/storage/base.py", line 227, in upload_object_via_stream
return self.driver.upload_object_via_stream(
File "/usr/local/lib/python3.8/site-packages/libcloud/storage/drivers/s3.py", line 843, in upload_object_via_stream
return self._put_object(
File "/usr/local/lib/python3.8/site-packages/libcloud/storage/drivers/s3.py", line 1007, in _put_object
result_dict = self._upload_object(
File "/usr/local/lib/python3.8/site-packages/libcloud/storage/base.py", line 874, in _upload_object
response = self.connection.request(
File "/usr/local/lib/python3.8/site-packages/libcloud/common/base.py", line 659, in request
return request_to_be_executed(
File "/usr/local/lib/python3.8/site-packages/libcloud/common/base.py", line 678, in _retryable_request
self.connection.prepared_request(
File "/usr/local/lib/python3.8/site-packages/libcloud/http.py", line 260, in prepared_request
self.response = self.session.send(
File "/usr/local/lib/python3.8/site-packages/requests/sessions.py", line 645, in send
r = adapter.send(request, **kwargs)
File "/usr/local/lib/python3.8/site-packages/requests/adapters.py", line 440, in send
resp = conn.urlopen(
File "/usr/local/lib/python3.8/site-packages/urllib3/connectionpool.py", line 703, in urlopen
httplib_response = self._make_request(
File "/usr/local/lib/python3.8/site-packages/urllib3/connectionpool.py", line 398, in _make_request
conn.request(method, url, **httplib_request_kw)
File "/usr/local/lib/python3.8/site-packages/urllib3/connection.py", line 239, in request
super(HTTPConnection, self).request(method, url, body=body, headers=headers)
File "/usr/local/lib/python3.8/http/client.py", line 1256, in request
self._send_request(method, url, body, headers, encode_chunked)
File "/usr/local/lib/python3.8/http/client.py", line 1302, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "/usr/local/lib/python3.8/http/client.py", line 1251, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "/usr/local/lib/python3.8/http/client.py", line 1040, in _send_output
for chunk in chunks:
File "/usr/local/lib/python3.8/http/client.py", line 999, in _read_readable
datablock = datablock.encode("iso-8859-1")
UnicodeEncodeError: 'latin-1' codec can't encode character '\u2019' in position 5251: ordinal not in range(256)
```

I'm running this from inside a k8s pod in a GKE cluster, trying to write to a GCS bucket.

```
apache-libcloud version: 3.5.1
python version: 3.8.15
pod image: python:3.8-slim
```

I'm not sure what are the steps to reproduce it. It's a CSV file generated by pulling some BigQuery schema metadata. It works locally, but when I ran it in the pod it raised this error.

Inizia con upload_object_via_stream in libcloud/storage/base.py e con il percorso del driver S3 in libcloud/storage/drivers/s3.py, quindi segui la preparazione della richiesta attraverso libcloud/common/base.py e libcloud/http.py. Riproduci il problema con un CSV contenente caratteri non appartenenti a Latin-1 nell’ambiente Python e container indicato. Il lavoro è completato quando l’upload gestisce tale contenuto CSV senza il UnicodeEncodeError e include una copertura di regressione per il percorso che fallisce.

Scritto dal modello di indicizzazione a partire dal testo della issue.