feat: Upgrade to uv and Python 3.12

Readme.md

@@ -65,12 +65,19 @@ The simplest way.
 We use [pre-commit](https://pre-commit.com/) for basic
 style fixes and checks.
 
-Also, pytest is used for testing.
-It can be installed with `pip install -r requirements.dev.txt`.
+Install the development environment with:
+```bash
+uv sync
+```
 
 To run tests:
 ```bash
-pytest --cov=src tests
+make test
+```
+
+To run all checks:
+```bash
+make check
 ```
 
 ## FAQ