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/socket-proxy/socket-proxyd.c

@@ -16,8 +16,8 @@
 #include "alloc-util.h"
 #include "build.h"
 #include "daemon-util.h"
-#include "event-util.h"
 #include "errno-util.h"
+#include "event-util.h"
 #include "fd-util.h"
 #include "log.h"
 #include "main-func.h"