Use new gofumpt (#21613)

Update tinylib. Should fix CI.

`gofumpt -w .&&go generate ./...`

internal/dsync/locked_rand.go

@@ -33,7 +33,7 @@ func (r *lockedRandSource) Int63() (n int64) {
 	r.lk.Lock()
 	n = r.src.Int63()
 	r.lk.Unlock()
-	return
+	return n
 }
 
 // Seed uses the provided seed value to initialize the generator to a