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Require dune 2.5 to avoid a bug

https://github.com/ocaml/dune/issues/3252 causes 0install-solver to fail
to install, with:

# File "src/tests/dune", line 3, characters 10-23:
# 3 | (deps %{bin:0install})
# ^^^^^^^^^^^^^
# Error: Program 0install not found in the tree or in PATH

Changed files
+1 -1
packages
0install-solver
0install-solver.2.17
+1 -1
packages/0install-solver/0install-solver.2.17/opam
···
]
depends: [
"ocaml" {>= "4.08.0"}
-
"dune" {>= "2.1"}
+
"dune" {>= "2.5"}
"ounit2" {with-test}
]
description: """