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memtrace-mirage do not work on OCaml 5

It fails with:

```
#=== ERROR while compiling memtrace-mirage.0.2.1.2.2 ==========================#
# context 2.2.0~alpha~dev | linux/x86_64 | ocaml-variants.5.0.0+trunk | file:///home/opam/opam-repository
# path ~/.opam/5.0/.opam-switch/build/memtrace-mirage.0.2.1.2.2
# command ~/.opam/opam-init/hooks/sandbox.sh build dune build -p memtrace-mirage -j 47 @install
# exit-code 1
# env-file ~/.opam/log/memtrace-mirage-8-18ec84.env
# output-file ~/.opam/log/memtrace-mirage-8-18ec84.out
### output ###
# (cd _build/default && /home/opam/.opam/5.0/bin/ocamlc.opt -w -40 -g -bin-annot -I src/.memtrace.objs/byte -I /home/opam/.opam/5.0/lib/bytes -I /home/opam/.opam/5.0/lib/cstruct -I /home/opam/.opam/5.0/lib/fmt -I /home/opam/.opam/5.0/lib/lwt -I /home/opam/.opam/5.0/lib/mirage-clock -I /home/opam/.opam/5.0/lib/mirage-flow -I /home/opam/.opam/5.0/lib/ptime -intf-suffix .ml -no-alias-deps -open Memtrace__ -o src/.memtrace.objs/byte/memtrace__Trace.cmo -c -impl src/trace.ml)
# File "src/trace.ml", lines 524-530, characters 16-4:
# 524 | ................Hashtbl.MakeSeeded (struct
# 525 | type t = int
# 526 | let hash _seed (id : t) =
# 527 | let h = id * 189696287 in
# 528 | h lxor (h lsr 23)
# 529 | let equal (a : t) (b : t) = a = b
# 530 | end)
# Error: Modules do not match:
# sig
# type t = int
# val hash : 'a -> t -> int
# val equal : t -> t -> bool
# 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
```

And is due to the Hashtbl signature changes in OCaml 5.

Changed files
+2 -2
packages
memtrace-mirage
memtrace-mirage.0.2.1.2.1
memtrace-mirage.0.2.1.2.2
+1 -1
packages/memtrace-mirage/memtrace-mirage.0.2.1.2.1/opam
···
bug-reports: "https://github.com/hannesm/memtrace-mirage/issues"
depends: [
"dune" {>= "2.3"}
-
"ocaml" {>= "4.11.0"}
+
"ocaml" {>= "4.11.0" & < "5.0"}
"mirage-flow" {>= "3.0.0"}
"mirage-clock" {>= "4.0.0"}
"ptime" {>= "1.0.0"}
+1 -1
packages/memtrace-mirage/memtrace-mirage.0.2.1.2.2/opam
···
bug-reports: "https://github.com/hannesm/memtrace-mirage/issues"
depends: [
"dune" {>= "2.3"}
-
"ocaml" {>= "4.11.0"}
+
"ocaml" {>= "4.11.0" & < "5.0"}
"mirage-flow" {>= "3.0.0"}
"mirage-clock" {>= "4.0.0"}
"ptime" {>= "1.0.0"}