fix incorrect version selector constraint

src/poetry/version/version_selector.py

@@ -32,7 +32,7 @@ class VersionSelector:
             package_name,
             package_name,
             {
             {
                 "version": target_package_version or "*",
                 "version": target_package_version or "*",
-                "allow_prereleases": allow_prereleases,
+                "allow-prereleases": allow_prereleases,
                 "source": source,
                 "source": source,
             },
             },
         )
         )

tests/helpers.py

@@ -54,7 +54,7 @@ def get_dependency(
         constraint = {"version": constraint}
         constraint = {"version": constraint}
 
 
     constraint["optional"] = optional
     constraint["optional"] = optional
-    constraint["allow_prereleases"] = allows_prereleases
+    constraint["allow-prereleases"] = allows_prereleases
 
 
     return Factory.create_dependency(name, constraint or "*", groups=groups)
     return Factory.create_dependency(name, constraint or "*", groups=groups)