Bump minimal base version

Author: voodoos

packages/ocaml-lsp-server/ocaml-lsp-server.1.19.0/opam

@@ -20,7 +20,7 @@ bug-reports: "https://github.com/ocaml/ocaml-lsp/issues"
 depends: [
   "dune" {>= "3.0"}
   "yojson"
-  "base"
+  "base" {>= "v0.16.0"}
   "lsp" {= version}
   "jsonrpc" {= version}
   "re" {>= "1.5.0"}