Report that the opam version is 2.2.0 while solving

Certain packages require that the opam version be 2.2.0 or above, and
the solver will refuse to include those packages with the current opam
version baked into dune, which is 2.2.0~alpha-vendored.

Signed-off-by: Stephen Sherratt <[email protected]>

Author: gridbugs

test/blackbox-tests/test-cases/pkg/just-print-solver-env.t

@@ -44,14 +44,14 @@ Add some build contexts with different environments
   - with-dev-setup = false
   - with-doc = false
   Solver environment for lock directory dune.linux.lock:
-  - opam-version = 2.2.0~alpha-vendored
+  - opam-version = 2.2.0
   - os = linux
   - post = true
   - with-dev-setup = false
   - with-doc = false
   Solver environment for lock directory dune.linux.no-doc.lock:
   - arch = x86_64
-  - opam-version = 2.2.0~alpha-vendored
+  - opam-version = 2.2.0
   - os = linux
   - os-distribution = ubuntu
   - os-family = ubuntu
@@ -61,7 +61,7 @@ Add some build contexts with different environments
   - with-dev-setup = false
   - with-doc = false
   Solver environment for lock directory dune.lock:
-  - opam-version = 2.2.0~alpha-vendored
+  - opam-version = 2.2.0
   - post = true
   - with-dev-setup = false
   - with-doc = false

vendor/opam/src/core/opamVersionInfo.ml

@@ -1 +1 @@
-let version = "2.2.0~alpha-vendored"
+let version = "2.2.0"