build(deps): bump acadrust to 8e86b4d (MTEXT parser gap fixes)

Picks up the ezdxf-audited MTEXT parser fixes: raw LF as a paragraph
break, control chars rendered as spaces, and the corrected `\c`
true-color byte order (so `\c` colors no longer come out red/blue
swapped).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Cargo.lock

@@ -73,7 +73,7 @@ checksum = "366ffbaa4442f4684d91e2cd7c5ea7c4ed8add41959a31447066e279e432b618"
 [[package]]
 name = "acadrust"
 version = "0.4.0"
-source = "git+https://github.com/OpenAEC-Foundation/acadifc?branch=main#b16137ff0143bf480edfbc8e12f89068a76316de"
+source = "git+https://github.com/OpenAEC-Foundation/acadifc?branch=main#8e86b4de2233440aca7eaf43c9e2a1ba1495dea5"
 dependencies = [
  "ahash 0.8.12",
  "anyhow",