Update sysinfo and improve its use a bit (bevyengine#7826)

I made a few internal fixes in sysinfo so why not be able to benefit from them? :)

I explain the other changes directly in diff comments.

crates/bevy_diagnostic/Cargo.toml

@@ -24,10 +24,10 @@ bevy_utils = { path = "../bevy_utils", version = "0.9.0" }
 # MacOS
 [target.'cfg(all(target_os="macos"))'.dependencies]
 # Some features of sysinfo are not supported by apple. This will disable those features on apple devices
-sysinfo = { version = "0.27.1", default-features = false, features = [
+sysinfo = { version = "0.28.1", default-features = false, features = [
     "apple-app-store",
 ] }
 
 # Only include when not bevy_dynamic_plugin and on linux/windows/android
 [target.'cfg(any(target_os = "linux", target_os = "windows", target_os = "android"))'.dependencies]
-sysinfo = { version = "0.27.1", default-features = false }
+sysinfo = { version = "0.28.1", default-features = false }

crates/bevy_diagnostic/src/system_information_diagnostics_plugin.rs

@@ -39,7 +39,7 @@ impl SystemInformationDiagnosticsPlugin {
 pub mod internal {
     use bevy_ecs::{prelude::ResMut, system::Local};
     use bevy_log::info;
-    use sysinfo::{CpuExt, System, SystemExt};
+    use sysinfo::{CpuExt, CpuRefreshKind, RefreshKind, System, SystemExt};
 
     use crate::{Diagnostic, Diagnostics};
 
@@ -69,23 +69,19 @@ pub mod internal {
         mut sysinfo: Local<Option<System>>,
     ) {
         if sysinfo.is_none() {
-            *sysinfo = Some(System::new_all());
+            *sysinfo = Some(System::new_with_specifics(
+                RefreshKind::new()
+                    .with_cpu(CpuRefreshKind::new().with_cpu_usage())
+                    .with_memory(),
+            ));
         }
         let Some(sys) = sysinfo.as_mut() else {
             return;
         };
 
-        sys.refresh_cpu();
+        sys.refresh_cpu_specifics(CpuRefreshKind::new().with_cpu_usage());
         sys.refresh_memory();
-        let current_cpu_usage = {
-            let mut usage = 0.0;
-            let cpus = sys.cpus();
-            for cpu in cpus {
-                usage += cpu.cpu_usage(); // NOTE: this returns a value from 0.0 to 100.0
-            }
-            // average
-            usage / cpus.len() as f32
-        };
+        let current_cpu_usage = sys.global_cpu_info().cpu_usage();
         // `memory()` fns return a value in bytes
         let total_mem = sys.total_memory() as f64 / BYTES_TO_GIB;
         let used_mem = sys.used_memory() as f64 / BYTES_TO_GIB;