Update webserver to comply with websockets 14.1 version

[PMohanJ]

Reference the issue numbers and reviewers
#170 @ehfd

Explain relevant issues and how this pull request solves them
Due to latest version release of websockets to 14.1 the current implementation requires refactoring to comply with the latest release

Describe the changes in code and its dependencies and justify that they work as intended after testing
Created custom_response function to allow the response to accept bytes type to have backword compatibility to server web pages via python server, of which is being handled by Nginx server now.

Describe alternatives you've considered
NA

Additional context
NA

• I confirm that this pull request is relevant to the scope of this project. If you know that upstream projects are the cause of this problem, please file the pull request there.
• I confirm that this pull request has been tested thoroughly and to the best of my knowledge that additional unintended problems do not arise.
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[alexeadem]

@ehfd I confirm this PR works with deb12 and websockets 14.2 in QBO

See script to compile for Debian 12:

https://github.com/alexeadem/selkies-gstreamer/tree/pr-171-deb12

 docker exec -it d5f886970e4c bash
root@d5f886970e4c:~# 
root@d5f886970e4c:~# pip list | grep -E 'selkies-gstreamer|websockets|asyncio'
WARNING: The directory '/home/qbo/.cache/pip' or its parent directory is not owned or is not writable by the current user. The cache has been disabled. Check the permissions and owner of that directory. If executing pip with sudo, you should use sudo's -H flag.
selkies-gstreamer  1.6.2+33.g4820b7a
websockets         14.2

nvidia-smi 
Sun Feb  2 09:49:33 2025       
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 565.77                 Driver Version: 565.77         CUDA Version: 12.7     |
|-----------------------------------------+------------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id          Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util  Compute M. |
|                                         |                        |               MIG M. |
|=========================================+========================+======================|
|   0  NVIDIA RTX A500 Laptop GPU     Off |   00000000:03:00.0 Off |                  N/A |
| N/A   49C    P8              6W /   30W |      11MiB /   4096MiB |      0%      Default |
|                                         |                        |                  N/A |
+-----------------------------------------+------------------------+----------------------+
                                                                                         
+-----------------------------------------------------------------------------------------+
| Processes:                                                                              |
|  GPU   GI   CI        PID   Type   Process name                              GPU Memory |
|        ID   ID                                                               Usage      |
|=========================================================================================|
|    0   N/A  N/A      3596      G   /usr/bin/gnome-shell                            1MiB |
+-----------------------------------------------------------------------------------------+

Why Debian 12 instead of Ubuntu? Cause Kind images are maintained by the https://github.com/kubernetes-sigs/kind team and use systemd rather than supervisord

[ehfd]

Thanks for the information. Please have patience.