Utilities: Use new global variables at /sys/kernel/ directory

Author: https://github.com/supercomputer7
Commit: 9d1ba0e6ad
Pull-request: https://github.com/SerenityOS/serenity/pull/15593
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/kleinesfilmroellchen ✅

Userland/Utilities/dmesg.cpp

@@ -11,10 +11,10 @@
 ErrorOr<int> serenity_main(Main::Arguments)
 {
     TRY(Core::System::pledge("stdio rpath"));
-    TRY(Core::System::unveil("/proc/dmesg", "r"));
+    TRY(Core::System::unveil("/sys/kernel/dmesg", "r"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
-    auto file = TRY(Core::File::open("/proc/dmesg", Core::OpenMode::ReadOnly));
+    auto file = TRY(Core::File::open("/sys/kernel/dmesg", Core::OpenMode::ReadOnly));
     auto buffer = file->read_all();
     out("{}", StringView { buffer });
     return 0;