Remove unused dev dependencies.

[rtibbles]

Summary

Description of the change(s) you made

• Removes dev dependencies that are not referenced anywhere in the code base, nor used as part of standard dev process (e.g. pre-commit is left in)
• This does leave in some profiling tools, which are referenced in some of the profiling code. We could in theory split this out in future, but seemed simplest to leave it for now.

Manual verification steps performed

1. Pip synced the dev requirements
2. pip install the requirements
3. ensured that the dev server and services still ran

[vkWeb]

Clean! <3