Fix METADATA version for dagger2

Exempt-From-Owner-Approval: No code change
Test: NA
Change-Id: I10faff721fd328d47b65ea0b8b90c1adaa6f4bd1
diff --git a/METADATA b/METADATA
index 12c582c..59b9e25 100644
--- a/METADATA
+++ b/METADATA
@@ -11,7 +11,7 @@
     type: GIT
     value: "https://github.com/google/dagger"
   }
-  version: "2.23.1"
+  version: "dagger-2.23.1"
   last_upgrade_date { year: 2019 month: 6 day: 14 }
   license_type: PERMISSIVE
 }