fix: Ensure Scheduler::get_global_tick() is monotonic (#672)

* fix: Ensure Scheduler::get_global_tick() is monotonic

* chore: fix changeset

Author: FoniksFox

.changesets/scheduler-monotonic.md

@@ -0,0 +1,2 @@
+release: patch
+summary: Adds a check to ensure return values from Scheduler::get_global_tick() are monotonic (never get decreasing values)

Src/HALAL/Services/Time/Scheduler.cpp

@@ -101,10 +101,16 @@ void Scheduler::update() {
 }
 
 uint64_t Scheduler::get_global_tick() {
+    static uint64_t last_tick{0};
     SchedLock();
     uint64_t tick = global_tick_us_;
     tick += Scheduler_global_timer->CNT;
     SchedUnlock();
+    if (tick < last_tick) [[unlikely]] {
+        tick = last_tick;
+    } else {
+        last_tick = tick;
+    }
     return tick;
 }