Bump Mainline Module versionNumber

Required by mainline team to unblock mainline engprod team tests.

Following example CLs (ag/13050028, ag/12888579)
provided by mainline team to update version to 309999900

Bug: 174770721
Test: builds
Change-Id: If0d4eeeba429d351328d0f64b6588c1b8ffaeafe
Merged-In: If0d4eeeba429d351328d0f64b6588c1b8ffaeafe
diff --git a/apex/apex_manifest.json b/apex/apex_manifest.json
index efa3993..db47ed5 100644
--- a/apex/apex_manifest.json
+++ b/apex/apex_manifest.json
@@ -1,4 +1,4 @@
 {
     "name": "com.android.ipsec",
-    "version": 300900700
+    "version": 309999900
 }