Merge branch 'fix/michele/why3-version' into 'master'

Settle for Why3 1.5.1.

See merge request laiser/caisar!77

caisar.opam

@@ -29,7 +29,7 @@ depends: [
   "menhirLib" {>= "20210310"}
   "ppx_deriving_yojson" {>= "3.6.1"}
   "csv" {>= "2.4"}
-  "why3" {>= "1.5.0"}
+  "why3" {= "1.5.1"}
   "re" {>= "1.10.4"}
   "caisar-nnet" {= version}
   "caisar-ovo" {= version}

dune-project

@@ -82,7 +82,7 @@
    (menhirLib (>= 20210310))
    (ppx_deriving_yojson (>= 3.6.1))
    (csv (>= 2.4))
-   (why3 (>= 1.5.0))
+   (why3 (= 1.5.1))
    (re (>= 1.10.4))
    (caisar-nnet (= :version))
    (caisar-ovo (= :version))