fix: correct dune dependency syntax in dune-project

Co-authored-by: aider (openai//workspace/models/openai-mirror/gpt-oss-120b/) <aider@aider.chat>

Author: zenfey

dune-project

@@ -19,6 +19,6 @@
  (name dune-ai-context)
  (synopsis "Tool to extract vendor library dependencies from Dune files and generate .mli interface files from their .cmi files.")
  (description "dune-ai-context parses the external library dependencies of an OCaml project using `dune describe external-lib-deps`, filters out `ppx_` packages, locates the corresponding `.cmi` files in the OPAM switch, and writes their interface signatures to `vendor_interfaces/<library>.mli`. This provides a convenient context for AI‑assisted coding tools.")
- (depends ocaml dune (>= 3.1) sexplib str unix compiler-libs.common)
+ (depends ocaml (dune (>= 3.1)) sexplib str unix compiler-libs.common)
  (tags
   ("ocaml" "dune" "vendor" "cmi" "interface" "AI tool" "LLM")))