Remove the multidict<7.2 dev constraint once Litestar works with multidict 7.2 #303

#302 added constraint-dependencies = ["multidict<7.2"] under [tool.uv] so CI stays green.

multidict 7.2.0 made CIMultiDictProxy.__new__() require the proxied multidict (aio-libs/multidict#1782). Litestar's Headers subclasses CIMultiDictProxy and converts a raw header list in __init__, which now fails in __new__ first with TypeError: ctor requires CIMultiDict or CIMultiDictProxy instance, not <class 'list'>. Every Litestar request hits it.

The cap only affects lite-bootstrap's own lock and CI; the published package does not constrain multidict.

Done when

• multidict or Litestar ships a release that fixes this.
• The [tool.uv] constraint is removed and CI is green with the newest multidict.

While the cap is in place, the scheduled dependency check cannot see a fix, so check upstream by hand.