python 3.8 is not compatible: Solving environment is impossible

## Problem
**Bug 1**
`conda env create --file ./conda/environment-base.yml --name $MY_ENV_NAME`
The yml file use python 3.8, conda can not solving environment.
If it change to python 3.6, every install step will work.

But python 3.6 env will cause new problem in installing robothor_plugin when buliding opencv-python wheel(new version can not bulid successful).
I use `opencv-python==4.5.4.60` in `extra_requirements_txt` to solve it.

Downloading dataset can not work well in python 3.6 too.
`bash datasets/download_navigation_datasets.sh robothor-objectnav`

**Bug 2**
File "/home/fy/allenact/allenact/base_abstractions/distributions.py", line 3, in
from typing import Any, Union, Callable, TypeVar, Dict, Optional, cast, Protocol
ImportError: cannot import name 'Protocol'

My solution
`pip install typing_extensions==4.1.1`

/home/fy/allenact/allenact/base_abstractions/distributions.py

```
# from typing import Any, Union, Callable, TypeVar, Dict, Optional, cast, Protocol
from typing import Any, Union, Callable, TypeVar, Dict, Optional, cast
from typing_extensions import Protocol
```

----------------------------------

**Bug 3**
File "/home/fy/anaconda3/envs/allenact/lib/python3.6/site-packages/imageio_ffmpeg/_utils.py", line 6, in
import importlib.resources
ModuleNotFoundError: No module named 'importlib.resources'

My solution
pip install importlib-resources==5.4.0

/home/fy/anaconda3/envs/allenact/lib/python3.6/site-packages/imageio_ffmpeg/_utils.py

```
# import importlib.resources
import importlib_resources as importlib_resources
```
```
def _get_bin_dir():
if sys.version_info < (3, 9):
context = importlib_resources.path("imageio_ffmpeg.binaries", "__init__.py")
else:
ref = importlib_resources.files("imageio_ffmpeg.binaries") / "__init__.py"
context = importlib_resources.as_file(ref)
with context as path:
pass
# Return the dir. We assume that the data files are on a normal dir on the fs.
return str(path.parent)
```
## Desktop
Ubuntu 22.04