allow rocq 9.1 (#1832)

Author: garrigue

coq-mathcomp-classical.opam

@@ -16,7 +16,7 @@ build: [make "-C" "classical" "-j%{jobs}%"]
 install: [make "-C" "classical" "install"]
 depends: [
   ("coq" {>= "8.20" & < "8.21~"}
-  | "coq-core" { (>= "9.0" & < "9.1~") | (= "dev") })
+  | "coq-core" { (>= "9.0" & < "9.2~") | (= "dev") })
   "coq-mathcomp-ssreflect" { (>= "2.4.0" & < "2.6~") | (= "dev") }
   "coq-mathcomp-fingroup"
   "coq-mathcomp-algebra"