Fix missing stats when migrating from 1.13.0 to 1.14.x

[Theelx]

Hello! I noticed that when I upgraded from 1.13.0 to 1.14.4 earlier today, the statistics and charts for completed experiments were blank. In order to fix that, I re-added sqlitedict as a dependency and added a short migration step from sqlitedict to diskcache. Additionally, I noticed that when I tried to run uv on this repo, it gave me an error because my pyenv version is 3.12.3 but this repo only allowed 3.10.x. I have run this codebase, including normal training, grid search, and most of the features, on 3.11.9 and 3.12.3 successfully without any issues. I've tested it on Ubuntu 22.04 and Linux Mint 22.1 (based on Ubuntu 24.04). I don't have access to any Windows or Mac machines, otherwise I'd have tested on those, however there shouldn't be any issues with only slightly loosening the CPython version requirements. 3.13 and 3.14 have a bunch of weird changes with the C-API and aren't widely supported, but <=3.12 is quite widely supported so it should help the popularity of this project if we let more versions install it.