fix biocaml.0.11.0 bounds for core_kernel

see #28175 (comment)

Author: raphael-proust

packages/biocaml/biocaml.0.11.0/opam

@@ -29,7 +29,7 @@ depends: [
   "ocaml" {< "5.0"}
   "base64"
   "dune" {>= "1.0"}
-  "core_kernel" {>= "v0.14.0"}
+  "core_kernel" {>= "v0.14.0" & < "v0.15.0"}
   "sexplib"
   "camlzip" {>= "1.05"}
   "xmlm"