Update dependencies for imdb example

[benblamey]

This is verbatim from Addi's code on Slack.
I have tested that it builds. It takes 300 seconds to build, and versions of numpy are installed, then uninstalled.

[+] Building 300.6s (12/12) FINISHED                                                                                                                                                                              
 => [internal] load build definition from Dockerfile                                                                                                                                                         0.0s
 => => transferring dockerfile: 271B                                                                                                                                                                         0.0s
 => [internal] load .dockerignore                                                                                                                                                                            0.0s
 => => transferring context: 2B                                                                                                                                                                              0.0s
 => [internal] load metadata for docker.io/library/python:3.8.9                                                                                                                                              2.0s
 => [auth] library/python:pull token for registry-1.docker.io                                                                                                                                                0.0s
 => [internal] load build context                                                                                                                                                                            0.0s
 => => transferring context: 85B                                                                                                                                                                             0.0s
 => CACHED [1/6] FROM docker.io/library/python:3.8.9@sha256:49d05fff9cb3b185b15ffd92d8e6bd61c20aa916133dca2e3dbe0215270faf53                                                                                 0.0s
 => [2/6] COPY requirements.txt /app/                                                                                                                                                                        0.0s
 => [3/6] WORKDIR /app                                                                                                                                                                                       0.0s
 => [4/6] RUN pip install -r requirements.txt                                                                                                                                                              153.0s
 => [5/6] RUN pip install -e git+https://github.com/scaleoutsystems/fedn.git@develop#egg=fedn&subdirectory=fedn                                                                                            116.0s
 => [6/6] RUN pip install numpy==1.19.5                                                                                                                                                                      6.1s 
 => exporting to image                                                                                                                                                                                      23.3s 
 => => exporting layers                                                                                                                                                                                     23.3s 
 => => writing image sha256:dd5d61c5fe0252dc5de0adce21051fb86de93ee733fedeb199321080e404e8b4                                                                                                                 0.0s 
                                                                                                                                                                                                                  
Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them                `

[ahellander]

Why the need to change the install to develop instead of main?

[benblamey]

I agree. I can't test fedn on my own machine anyway because of this issue:
scaleoutsystems/fedn#393

[ahellander]

We should make an effort to support 3.10 native. But in the meantime, did you see that we have a vscode devcontainer and also a docker-compose that will bring it up?

[ahellander]

Closing since fedn supports 3.10 since 0.3.3