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/psi-util.c

@@ -11,8 +11,8 @@
 #include "fileio.h"
 #include "parse-util.h"
 #include "psi-util.h"
-#include "string-util.h"
 #include "stat-util.h"
+#include "string-util.h"
 #include "strv.h"
 
 int read_resource_pressure(const char *path, PressureType type, ResourcePressure *ret) {