Update packages/caisar/caisar.2.0/opam

Author: avsm

packages/caisar/caisar.2.0/opam

@@ -34,6 +34,7 @@ depends: [
   "ppx_inline_test" {>= "0.12.0"}
   "ppx_deriving_yojson" {>= "3.6.1"}
   "odoc" {with-doc}
+  "conf-python-3" {with-test}
 ]
 build: [
   ["dune" "subst"] {dev}