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cairo2 0.5 is not compatible with ocaml 5

```
=== ERROR while compiling cairo2.0.5 =========================================#
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/cairo2.0.5
command ~/.opam/opam-init/hooks/sandbox.sh build ocaml setup.ml -configure --prefix /home/opam/.opam/5.0 --disable-lablgtk2
exit-code 2
env-file ~/.opam/log/cairo2-6-d959c9.env
output-file ~/.opam/log/cairo2-6-d959c9.out
File "./setup.ml", line 316, characters 20-36:
316 | String.compare (String.lowercase s1) (String.lowercase s2)
^^^^^^^^^^^^^^^^
Error: Unbound value String.lowercase
```

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

Changed files
+1 -1
packages
cairo2
cairo2.0.5
+1 -1
packages/cairo2/cairo2.0.5/opam
···
["ocamlfind" "remove" "cairo2"]
]
depends: [
-
"ocaml"
"base-bigarray"
"ocamlfind" {build}
"ocamlbuild" {build}
···
["ocamlfind" "remove" "cairo2"]
]
depends: [
+
"ocaml" {< "5.0"}
"base-bigarray"
"ocamlfind" {build}
"ocamlbuild" {build}