Use time.Unix instead of UnixMilli (for Go 1.15 compat)

pkg/service/wire_gen.go

@@ -1,7 +1,8 @@
 // Code generated by Wire. DO NOT EDIT.
 
 //go:generate go run github.com/google/wire/cmd/wire
-//+build !wireinject
+//go:build !wireinject
+// +build !wireinject
 
 package service
 

pkg/sfu/streamallocator.go

@@ -939,7 +939,7 @@ func (s *StreamAllocator) isTimeToBoost() bool {
 }
 
 func (s *StreamAllocator) resetBoost() {
-	s.lastBoostTime = time.UnixMilli(0)
+	s.lastBoostTime = time.Unix(0, 0)
 	s.boostedChannelCapacity = 0
 }