chore: replace 1<<31-1 with math.MaxInt32 (#392)

Author: vibe-sudo

multipool.go

@@ -124,7 +124,7 @@ func (mp *MultiPool) next(lbs LoadBalancingStrategy) (idx int) {
 	case RoundRobin:
 		return int(atomic.AddUint32(&mp.index, 1) % uint32(len(mp.pools)))
 	case LeastTasks:
-		leastTasks := 1<<31 - 1
+		leastTasks := math.MaxInt32
 		for i, pool := range mp.pools {
 			if n := pool.Running(); n < leastTasks {
 				leastTasks = n

multipool_func.go

@@ -71,7 +71,7 @@ func (mp *MultiPoolWithFunc) next(lbs LoadBalancingStrategy) (idx int) {
 	case RoundRobin:
 		return int(atomic.AddUint32(&mp.index, 1) % uint32(len(mp.pools)))
 	case LeastTasks:
-		leastTasks := 1<<31 - 1
+		leastTasks := math.MaxInt32
 		for i, pool := range mp.pools {
 			if n := pool.Running(); n < leastTasks {
 				leastTasks = n

multipool_func_generic.go

@@ -67,7 +67,7 @@ func (mp *MultiPoolWithFuncGeneric[T]) next(lbs LoadBalancingStrategy) (idx int)
 	case RoundRobin:
 		return int(atomic.AddUint32(&mp.index, 1) % uint32(len(mp.pools)))
 	case LeastTasks:
-		leastTasks := 1<<31 - 1
+		leastTasks := math.MaxInt32
 		for i, pool := range mp.pools {
 			if n := pool.Running(); n < leastTasks {
 				leastTasks = n