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uring <= 0.6 tests are not compatible with ocaml 5.1

```
\# /usr/bin/git --no-pager diff --no-index --color=always -u _build/default/README.md _build/default/.mdx/README.md.corrected
\# diff --git a/_build/default/README.md b/_build/default/.mdx/README.md.corrected
\# index 0bb1311..2888173 100644
\# --- a/_build/default/README.md
\# +++ b/_build/default/.mdx/README.md.corrected
\# @@ -39,7 +39,7 @@ To start, we'll open a file using `Uring.openat2`, which works much like the reg
\# ~resolve:Uring.Resolve.beneath
\# "test.log"
\# `Open_log;;
\# -val open_file : _[> `Open_log ] Uring.job option = Some <abstr>
\# +val open_file : ([> `Open_log ] as '_weak2) Uring.job option = Some <abstr>
\# ```
\#
\# `submit` returns `None` if the submission queue is full.
\# @@ -117,13 +117,15 @@ Finally, we close the file:
\#
\# ```ocaml
\# # Uring.close uring fd `Close_log;;
\# -- : _[> `Close_log | `Open_log | `Write_all ] Uring.job option = Some <abstr>
\# +- : ([> `Close_log | `Open_log | `Write_all ] as '_weak3) Uring.job option =
\# +Some <abstr>
\#
\# # Uring.submit uring;;
\# - : int = 1
\#
\# # wait_with_retry uring;;
\# -- : int * _[> `Close_log | `Open_log | `Write_all ] = (0, `Close_log)
\# +- : int * ([> `Close_log | `Open_log | `Write_all ] as '_weak3) =
\# +(0, `Close_log)
[...]
```

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

Changed files
+3 -3
packages
uring
uring.0.4
uring.0.5
uring.0.6
+1 -1
packages/uring/uring.0.4/opam
···
"-j"
jobs
"@install"
-
"@runtest" {with-test}
"@doc" {with-doc}
]
]
···
"-j"
jobs
"@install"
+
"@runtest" {with-test & ocaml:version < "5.1"}
"@doc" {with-doc}
]
]
+1 -1
packages/uring/uring.0.5/opam
···
"-j"
jobs
"@install"
-
"@runtest" {with-test}
"@doc" {with-doc}
]
]
···
"-j"
jobs
"@install"
+
"@runtest" {with-test & ocaml:version < "5.1"}
"@doc" {with-doc}
]
]
+1 -1
packages/uring/uring.0.6/opam
···
"-j"
jobs
"@install"
-
"@runtest" {with-test}
"@doc" {with-doc}
]
]
···
"-j"
jobs
"@install"
+
"@runtest" {with-test & ocaml:version < "5.1.0"}
"@doc" {with-doc}
]
]