Include 9 as the last allowed digit of default version code.

Due to go/aml-default-version-code, we are required to use the last digit for version code as 9.

Bug: 381839073
Test: presubmit
Test: adb install
Change-Id: Ia3534d687541a85042a328c307daf78b294b5d89
diff --git a/apex/builder.go b/apex/builder.go
index e5ae106..2b711a1 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -337,8 +337,8 @@
 		if err != nil {
 			ctx.ModuleErrorf("expected RELEASE_DEFAULT_UPDATABLE_MODULE_VERSION to be an int, but got %s", defaultVersion)
 		}
-		if defaultVersionInt%10 != 0 {
-			ctx.ModuleErrorf("expected RELEASE_DEFAULT_UPDATABLE_MODULE_VERSION to end in a zero, but got %s", defaultVersion)
+		if defaultVersionInt%10 != 0 && defaultVersionInt%10 != 9 {
+			ctx.ModuleErrorf("expected RELEASE_DEFAULT_UPDATABLE_MODULE_VERSION to end in a zero or a nine, but got %s", defaultVersion)
 		}
 		variantVersion := []rune(*a.properties.Variant_version)
 		if len(variantVersion) != 1 || variantVersion[0] < '0' || variantVersion[0] > '9' {