Version bump to AP4A.240925.021 [core/build_id.mk]

Change-Id: I1fbcb0db817ab11ca26c970cc8691bb6ec05a35e
diff --git a/core/build_id.mk b/core/build_id.mk
index 152e099..a35f4e6 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -18,4 +18,4 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-BUILD_ID=AP4A.240925.020
+BUILD_ID=AP4A.240925.021