tree-wide: Sort includes

This was done by running a locally built clang-format with
https://github.com/llvm/llvm-project/pull/137617 and
https://github.com/llvm/llvm-project/pull/137840 applied on all .c
and .h files.

src/basic/keyring-util.c

@@ -1,8 +1,8 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
+#include "alloc-util.h"
 #include "keyring-util.h"
 #include "log.h"
-#include "alloc-util.h"
 #include "memory-util.h"
 #include "missing_syscall.h"