AK3: don't attempt to AVBv1 sign if /system/bin/dalvikvm is not present

- latest Android has moved dalvikvm to /apex/com.android.art/bin/dalvikvm but there's currently no way to run this from recovery due to linkerconfig
- AVBv1 signing is most likely only needed on older devices running older Android which will still have /system/bin/dalvikvm so this shouldn't really affect anything

META-INF/com/google/android/updater-script

@@ -3,4 +3,4 @@
 # Dummy file; update-binary is a shell script (DO NOT CHANGE)
 #
 #
-# AK_BASE_VERSION=20230526
+# AK_BASE_VERSION=20230605