Fix UT compilation errors with GCC 13 due to missing <cstdint> includes (#2979)

GCC 13 no longer transitively includes <cstdint> from other standard
library headers. This causes compilation failures for code using types
like uint32_t and uintptr_t without explicitly including <cstdint>.

This commit adds the missing #include <cstdint> directives to:
- test/baidu_thread_local_unittest.cpp
- src/bthread/list_of_abafree_id.h

The errors were:
- error: 'uintptr_t' was not declared in this scope
- error: 'uint32_t' does not name a type

This change ensures compatibility with GCC 13 while maintaining
backward compatibility with older compiler versions.

Reference: https://gcc.gnu.org/gcc-13/porting_to.html

Author: XueSongTap

src/bthread/list_of_abafree_id.h

@@ -24,7 +24,7 @@
 
 #include <deque>
 #include <vector>
-
+#include <cstdint>
 #include "butil/macros.h"
 
 namespace bthread {

test/baidu_thread_local_unittest.cpp

@@ -17,6 +17,7 @@
 
 #include <gtest/gtest.h>
 #include <errno.h>
+#include <cstdint>
 #include "butil/thread_local.h"
 
 namespace {