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menhir 20220210 is not compatible with ocaml 5.1

Fails with
```
== ERROR while compiling menhir.20220210 ====================================#
context 2.2.0~alpha~dev | linux/x86_64 | ocaml-variants.5.1.0+trunk | file:///home/opam/opam-repository
path ~/.opam/5.1/.opam-switch/build/menhir.20220210
command ~/.opam/opam-init/hooks/sandbox.sh build dune build -p menhir -j 255
exit-code 1
env-file ~/.opam/log/menhir-7-34d49d.env
output-file ~/.opam/log/menhir-7-34d49d.out
\# output ###
(cd _build/default && /home/opam/.opam/5.1/bin/ocamlopt.opt -w -40 -safe-string -g -open MenhirSdk -g -I src/stage1/.main.eobjs/byte -I src/stage1/.main.eobjs/native -I /home/opam/.opam/5.1/lib/menhirLib -I /home/opam/.opam/5.1/lib/menhirSdk -I /home/opam/.opam/5.1/lib/ocaml/unix -I fix/src/.vendored_fix.objs/byte -I fix/src/.vendored_fix.objs/native -I pprint/src/.vendored_pprint.objs/byte -I pprint/src/.vendored_pprint.objs/native -intf-suffix .ml -no-alias-deps -open Dune__exe -o src/stage1/.main.eobjs/native/dune__exe__Back.cmx -c -impl src/stage1/back.ml)
File "src/back.ml", line 50, characters 21-39:
Error: The functor was expected to be applicative at this position
```

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

Changed files
+1 -1
packages
menhir
menhir.20220210
+1 -1
packages/menhir/menhir.20220210/opam
···
["dune" "build" "-p" name "-j" jobs]
]
depends: [
-
"ocaml" {>= "4.03.0"}
+
"ocaml" {>= "4.03.0" & < "5.1~"}
"dune" {>= "2.8.0"}
"menhirLib" {= version}
"menhirSdk" {= version}