fix dune lang version

Vincent Siles · facebook-github-bot · commit 88cfd6ddc9d6 · 2021-10-27T00:38:57.000-07:00
Summary: Spotted by dune devs in ocaml/dune#5040 The valid version number is 1.11 Reviewed By: madgen Differential Revision: D31953488 fbshipit-source-id: 398d844723dfdc93c73c3da3e7d185875fe49f18
diff --git a/hphp/hack/dune-project b/hphp/hack/dune-project
@@ -1 +1 @@
-(lang dune 1.11.4)
+(lang dune 1.11)
