Updating master default version

Test: presubmit
Bug: 231691643
Change-Id: I17837dd4799ab8eedff76deec20083281a19d964
diff --git a/apex/constants.go b/apex/constants.go
index c68edb7..82eebff 100644
--- a/apex/constants.go
+++ b/apex/constants.go
@@ -33,4 +33,4 @@
 // * AOSP            - xx9990000
 // * x-mainline-prod - xx9990000
 // * master          - 990090000
-const defaultManifestVersion = "339990000"
+const defaultManifestVersion = "990090000"