Bump up main major version to N+3

N+3 because we accidentally skipped a bump

Bug: 324280795
Test: None
Change-Id: I764e9f4e665bede7e2b1eaa5a957d4aaabdb6e52
diff --git a/common/hal/aidl_service/version_script.py b/common/hal/aidl_service/version_script.py
index 02bf97a..c35f0d2 100644
--- a/common/hal/aidl_service/version_script.py
+++ b/common/hal/aidl_service/version_script.py
@@ -20,7 +20,7 @@
 import re
 import sys
 
-BRANCH_SPECIFIC_VERSION_IDENTIFIER = 12  # main
+BRANCH_SPECIFIC_VERSION_IDENTIFIER = 15  # main
 DEFAULT_ENG_BUILD_NUMBER = 2147480000
 DEFAULT_BAD_BUILD_NUMBER = DEFAULT_ENG_BUILD_NUMBER - 1