Updating sdk_version for ModuleMetadata to "current"

As per the latest requirements, we need to have correct target_sdk_version for modules. The target_sdk_version for modules now defaults to correct version according to go/mainline-modules-target-sdk-version-fix if we have sdk_version as "current". Fixing it for ModuleMetadata.

Requirements: https://docs.partner.android.com/gms/policies/domains/mba/policies/tgt-sdk#new-march-2023-policy-release

Change-Id: Ia4ce3fac9e5857abf6855631a22768ffd6614d88
Test: N/A
Bug: b/289867668
diff --git a/Android.bp b/Android.bp
index 00708b4..c0453ac 100644
--- a/Android.bp
+++ b/Android.bp
@@ -20,7 +20,7 @@
 
 android_app {
     name: "ModuleMetadata",
-    sdk_version: "28",
+    sdk_version: "current",
 
     product_specific: true,
     optimize: {