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Increase lowerbound on dune for caisar-onnx.0.2

It fails when building with ocaml-protoc-plugin.4.2.0 with 2.9.3:

File "lib/onnx/dune", line 11, characters 11-30:
11 | (package ocaml-protoc-plugin))
^^^^^^^^^^^^^^^^^^^
Error: Package ocaml-protoc-plugin does not exist

Note that all subsequent versions of ocaml-proto-plugin require at least
Dune 3.2, so the simple lowerbound is sufficient - there's no version of
dependencies where this package can succesfully build with Dune 2.9.x

Changed files
+1 -1
packages
caisar-onnx
caisar-onnx.0.2
+1 -1
packages/caisar-onnx/caisar-onnx.0.2/opam
···
doc: "https://git.frama-c.com/pub/caisar"
bug-reports: "https://git.frama-c.com/pub/caisar/issues"
depends: [
-
"dune" {>= "2.9"}
+
"dune" {>= "3.0"}
"ocaml" {>= "4.13"}
"base" {>= "v0.14.0" & < "v0.17"}
"stdio" {>= "v0.14.0"}