chore: upgrade system-metrics to v1.5.0

- Updated gophpeek/system-metrics from v1.4.0 to v1.5.0
- Fixed test compatibility with PHP 8.4 int division behavior
- memoryMb can now be int or float, updated assertion to toBeNumeric()

Author: sylvesterdamgaard

tests/Feature/ChildProcessTrackingTest.php

@@ -166,7 +166,7 @@
     $cpuTimeMs = ($cpuUsagePercent / 100.0) * $durationSeconds * 1000.0;
 
     // Verify all values are usable
-    expect($memoryMb)->toBeFloat()->toBeGreaterThan(0.0);
+    expect($memoryMb)->toBeNumeric()->toBeGreaterThan(0.0); // Can be int or float in PHP 8.4
     expect($cpuUsagePercent)->toBeFloat()->toBeGreaterThanOrEqual(0.0);
     expect($durationSeconds)->toBeFloat()->toBeGreaterThanOrEqual(0.0); // Can be 0 on fast systems
     expect($cpuTimeMs)->toBeFloat()->toBeGreaterThanOrEqual(0.0);