Update module google.golang.org/grpc to v1.76.0

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

vendor/google.golang.org/grpc/internal/grpcsync/callback_serializer.go

@@ -80,25 +80,11 @@ func (cs *CallbackSerializer) ScheduleOr(f func(ctx context.Context), onFailure
 func (cs *CallbackSerializer) run(ctx context.Context) {
 	defer close(cs.done)
 
-	// TODO: when Go 1.21 is the oldest supported version, this loop and Close
-	// can be replaced with:
-	//
-	// context.AfterFunc(ctx, cs.callbacks.Close)
-	for ctx.Err() == nil {
-		select {
-		case <-ctx.Done():
-			// Do nothing here. Next iteration of the for loop will not happen,
-			// since ctx.Err() would be non-nil.
-		case cb := <-cs.callbacks.Get():
-			cs.callbacks.Load()
-			cb.(func(context.Context))(ctx)
-		}
-	}
+	// Close the buffer when the context is canceled
+	// to prevent new callbacks from being added.
+	context.AfterFunc(ctx, cs.callbacks.Close)
 
-	// Close the buffer to prevent new callbacks from being added.
-	cs.callbacks.Close()
-
-	// Run all pending callbacks.
+	// Run all callbacks.
 	for cb := range cs.callbacks.Get() {
 		cs.callbacks.Load()
 		cb.(func(context.Context))(ctx)

vendor/google.golang.org/grpc/internal/grpcsync/event.go

@@ -21,28 +21,25 @@
 package grpcsync
 
 import (
-	"sync"
 	"sync/atomic"
 )
 
 // Event represents a one-time event that may occur in the future.
 type Event struct {
-	fired int32
+	fired atomic.Bool
 	c     chan struct{}
-	o     sync.Once
 }
 
 // Fire causes e to complete.  It is safe to call multiple times, and
 // concurrently.  It returns true iff this call to Fire caused the signaling
-// channel returned by Done to close.
+// channel returned by Done to close. If Fire returns false, it is possible
+// the Done channel has not been closed yet.
 func (e *Event) Fire() bool {
-	ret := false
-	e.o.Do(func() {
-		atomic.StoreInt32(&e.fired, 1)
+	if e.fired.CompareAndSwap(false, true) {
 		close(e.c)
-		ret = true
-	})
-	return ret
+		return true
+	}
+	return false
 }
 
 // Done returns a channel that will be closed when Fire is called.
@@ -52,7 +49,7 @@ func (e *Event) Done() <-chan struct{} {
 
 // HasFired returns true if Fire has been called.
 func (e *Event) HasFired() bool {
-	return atomic.LoadInt32(&e.fired) == 1
+	return e.fired.Load()
 }
 
 // NewEvent returns a new, ready-to-use Event.