Importing ABC directly from collections was deprecated and will be removed in Python 3.10. Use collections.abc

```
odo/backends/sql.py
14:from collections import Iterator

odo/backends/hdfs.py
17:from collections import namedtuple, Iterator

odo/backends/tests/test_csv.py
13:from collections import Iterator

odo/backends/tests/test_sas.py
8:from collections import Iterator

odo/backends/text.py
5:from collections import Iterator

odo/backends/aws.py
9:from collections import Iterator

odo/backends/mongo.py
5:from collections import Iterator

odo/backends/dask.py
2:from collections import Iterator

odo/backends/sparksql.py
10:from collections import Iterator

odo/backends/json.py
5:from collections import Iterator, Iterable

odo/backends/sas.py
8:from collections import Iterator

odo/convert.py
7:from collections import Iterator, Iterable

odo/tests/test_convert.py
10:from collections import Iterator

odo/chunks.py
3:from collections import Iterator

odo/core.py
3:from collections import namedtuple, Iterator
```