python:3.10 also contains python 3.9

I pulled the latest "python:3.10" from dockerhub and expected it to not contain an interpreter for python 3.9. 

Apparently it does:
```
docker run -it docker.io/library/python:3.10 python3.9 --version
Python 3.9.2
docker run -it docker.io/library/python:3.10 python3.10 --version
Python 3.10.6
```

Is this intended?