Update packages/cohttp-async/cohttp-async.6.1.0/opam

Author: samoht

packages/cohttp-async/cohttp-async.6.1.0/opam

@@ -29,7 +29,7 @@ depends: [
   "cohttp" {= version}
   "async_kernel" {>= "v0.16.0"}
   "async_unix" {>= "v0.16.0"}
-  "async" {>= "v0.16.0"}
+  "async" {>= "v0.17.0"}
   "base" {>= "v0.16.0"}
   "core" {with-test}
   "core_unix" {>= "v0.14.0"}