Regenerate monster_test_bfbs_generated.h with alignas(uint64_t)

Commit 6dda43bb (#9425) added `alignas(uint64_t)` to embedded binary schemas
generated by `flatc --bfbs-gen-embed`. Regenerate `tests/monster_test_bfbs_generated.h`
via `scripts/generate_code.py` to keep checked-in test artifacts in sync and
unblock CI Check Generated Code.

GitOrigin-RevId: 3786479bebd33365edc91aa13388cdf95d7313d9

tests/monster_test_bfbs_generated.h

diff --git a/tests/monster_test_bfbs_generated.h b/tests/monster_test_bfbs_generated.h
index 30ce870..76a8a8d 100644
--- a/tests/monster_test_bfbs_generated.h
+++ b/tests/monster_test_bfbs_generated.h
@@ -12,7 +12,7 @@
 struct MonsterBinarySchema {
   static const uint8_t *data() {
     // Buffer containing the binary schema.
-    static const uint8_t bfbsData[14520] = {
+    alignas(uint64_t) static const uint8_t bfbsData[14520] = {
       0x20,0x00,0x00,0x00,0x42,0x46,0x42,0x53,0x00,0x00,0x00,0x00,0x14,0x00,0x20,0x00,0x04,0x00,0x08,0x00,
       0x0C,0x00,0x10,0x00,0x14,0x00,0x18,0x00,0x00,0x00,0x1C,0x00,0x14,0x00,0x00,0x00,0x58,0x00,0x00,0x00,
       0x34,0x00,0x00,0x00,0x24,0x00,0x00,0x00,0x18,0x00,0x00,0x00,0x70,0x0D,0x00,0x00,0x08,0x00,0x00,0x00,