Issue #3311472 Set minimum stability for form

Closes #3311472

src/Validator/VersionPolicyValidator.php

@@ -87,8 +87,10 @@ final class VersionPolicyValidator implements EventSubscriberInterface {
       $rules[] = MajorVersionMatch::class;
       // ...and it must be a known, secure, installable release...
       $rules[] = TargetVersionInstallable::class;
-      // ...and must be either a release candidate, or stable.
-      $rules[] = TargetVersionNotPreRelease::class;
+      if (!$stage instanceof ConsoleUpdateStage) {
+        // ...and must be either a release candidate, or stable.
+        $rules[] = TargetVersionNotPreRelease::class;
+      }
     }
 
     // If this is a cron update, we may need to do additional checks.