[deprecation] move pythonjsonlogger.jsonlogger to pythonjsonlogger.json

[mariot]

Proposed changes

• move pythonjsonlogger.jsonlogger to pythonjsonlogger.json per the docs

Related issues

• Closes #1027

Checklist

• [x] I consider the submitted work as finished
• [x] I tested the code for its functionality
• [ ] I wrote test cases for the relevant uses case
• [ ] I added/update the relevant documentation (either on github or on notion)
• [ ] Where necessary I refactored code to improve the overall quality

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...