Update packages/cohttp-async/cohttp-async.2.5.8/opam

Author: mseri

packages/cohttp-async/cohttp-async.2.5.8/opam

@@ -28,7 +28,7 @@ depends: [
   "async_kernel" {>= "v0.14.0"}
   "async_unix" {>= "v0.14.0"}
   "async" {>= "v0.14.0"}
-  "async" {< "v0.16.0" & with-test}
+  "async" {< "v0.15.0" & with-test}
   "base" {>= "v0.11.0"}
   "core" {with-test}
   "cohttp" {=version}