Use uv build

[tpgillam]

uv build takes about half the time of the old make build on my system. New in uv 0.4.5.

[Rupt]

Simple change. Workflows pass. In future, we might benefit from a little documentation for contributors to install a compatible uv.

[kesterlester]

I am reminded of A.C.Clarke's "Any sufficiently advanced technology is indistinguishable from magic" given that most of the diffs largely consist of making new lines of code be anagrams of old lines of code.