chore: build with Go 1.26; use Go 1.25 features (#10570)

WaitGroup.Go and built-in gomaxprocs handling.

Signed-off-by: Jakob Borg <jakob@kastelo.net>

lib/events/events_test.go

@@ -378,11 +378,8 @@ func TestUnsubscribeContention(t *testing.T) {
 
 	stopListeners := make(chan struct{})
 	var listenerWg sync.WaitGroup
-	listenerWg.Add(listeners)
 	for i := 0; i < listeners; i++ {
-		go func() {
-			defer listenerWg.Done()
-
+		listenerWg.Go(func() {
 			s := l.Subscribe(AllEvents)
 			defer s.Unsubscribe()
 
@@ -394,7 +391,7 @@ func TestUnsubscribeContention(t *testing.T) {
 					return
 				}
 			}
-		}()
+		})
 	}
 
 	// Start senders. These send pointless events until the stop channel is
@@ -403,11 +400,8 @@ func TestUnsubscribeContention(t *testing.T) {
 	stopSenders := make(chan struct{})
 	defer close(stopSenders)
 	var senderWg sync.WaitGroup
-	senderWg.Add(senders)
 	for i := 0; i < senders; i++ {
-		go func() {
-			defer senderWg.Done()
-
+		senderWg.Go(func() {
 			t := time.NewTicker(time.Millisecond)
 
 			for {
@@ -419,7 +413,7 @@ func TestUnsubscribeContention(t *testing.T) {
 					return
 				}
 			}
-		}()
+		})
 	}
 
 	// Give everything time to start up.