DX: define developer environment with `uv` #8

Job	Run time
lock / Check if PR already exists	0s
lock / Find lock files	3s
lock / pixi.lock	11s
lock / Check if Julia is used	1s
lock / .pre-commit-config.yaml	16s
lock / Determine Python versions	0s
lock / uv.lock	13s
lock / pip constraint files	0s
lock / Manifest.toml	27s
lock / Create PR	0s
lock / Push changes	10s
	1m 21s

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