fix(dwg): bump acadrust to fix solid hatch missing (#46)

Pull in acadrust ad0471e, which corrects the entity ENC color decode
for book colors. R2007 files whose hatches carry a book color (e.g.
the santeen.dwg from issue 46) desynced on read, dropping all 270
SOLID hatch boundaries; they now load and render.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

Cargo.lock

@@ -71,7 +71,7 @@ checksum = "366ffbaa4442f4684d91e2cd7c5ea7c4ed8add41959a31447066e279e432b618"
 [[package]]
 name = "acadrust"
 version = "0.4.0"
-source = "git+https://github.com/HakanSeven12/acadrust?branch=main#53859d5c646e268a5cdc5d7c6437174602c8a742"
+source = "git+https://github.com/HakanSeven12/acadrust?branch=main#ad0471e6011856acd9763f5a7fc5389d189931a6"
 dependencies = [
  "ahash 0.8.12",
  "anyhow",