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h2 0.6.1 is not compatible with ocaml 5

```
=== ERROR while compiling h2.0.6.1 ===========================================#
context 2.2.0~alpha~dev | linux/x86_64 | ocaml-base-compiler.5.0.0 | file:///home/opam/opam-repository
path ~/.opam/5.0/.opam-switch/build/h2.0.6.1
command ~/.opam/opam-init/hooks/sandbox.sh build dune build -p h2 -j 39
exit-code 1
env-file ~/.opam/log/h2-7-f4481b.env
output-file ~/.opam/log/h2-7-f4481b.out
(cd _build/default && /home/opam/.opam/5.0/bin/ocamlc.opt -w -40 -g -bin-annot -I lib/.h2.objs/byte -I /home/opam/.opam/5.0/lib/angstrom -I /home/opam/.opam/5.0/lib/base64 -I /home/opam/.opam/5.0/lib/bigstringaf -I /home/opam/.opam/5.0/lib/bytes -I /home/opam/.opam/5.0/lib/faraday -I /home/opam/.opam/5.0/lib/hpack -I /home/opam/.opam/5.0/lib/httpaf -I /home/opam/.opam/5.0/lib/psq -I /home/opam/.opam/5.0/lib/result -I /home/opam/.opam/5.0/lib/seq -no-alias-deps -open H2__ -o lib/.h2.objs/byte/h2__Scheduler.cmo -c -impl lib/scheduler.ml)
File "lib/scheduler.ml", lines 34-40, characters 10-6:
34 | ..........Hashtbl.MakeSeeded (struct
35 | type t = Stream_identifier.t
36 |
37 | let equal = Stream_identifier.( === )
38 |
39 | let hash i k = Hashtbl.seeded_hash i k
40 | end)
Error: Modules do not match:
sig
type t = H2__.Stream_identifier.t
val equal : Int32.t -> Int32.t -> bool
val hash : int -> 'a -> int
end
is not included in Hashtbl.SeededHashedType
The value `seeded_hash' is required but not provided
File "hashtbl.mli", line 411, characters 4-36: Expected declaration
```

Signed-off-by: Marcello Seri <marcello.seri@gmail.com>

Changed files
+1 -1
packages
h2
h2.0.6.1
+1 -1
packages/h2/h2.0.6.1/opam
···
["dune" "build" "-p" name "-j" jobs]
]
depends: [
-
"ocaml" {>= "4.06"}
"dune" {>= "1.7"}
"alcotest" {with-test}
"yojson" {with-test}
···
["dune" "build" "-p" name "-j" jobs]
]
depends: [
+
"ocaml" {>= "4.06" & < "5.0"}
"dune" {>= "1.7"}
"alcotest" {with-test}
"yojson" {with-test}