Fix missing read waiter for cancelers

Author: nekohasekai

go.mod

@@ -26,7 +26,7 @@ require (
 	github.com/sagernet/gvisor v0.0.0-20241123041152-536d05261cff
 	github.com/sagernet/quic-go v0.49.0-beta.1
 	github.com/sagernet/reality v0.0.0-20230406110435-ee17307e7691
-	github.com/sagernet/sing v0.6.8-0.20250429070844-b63643251ed5
+	github.com/sagernet/sing v0.6.8
 	github.com/sagernet/sing-dns v0.4.2
 	github.com/sagernet/sing-mux v0.3.2
 	github.com/sagernet/sing-quic v0.4.1-0.20250423030647-0eb05f373a76

go.sum

@@ -119,8 +119,8 @@ github.com/sagernet/quic-go v0.49.0-beta.1/go.mod h1:uesWD1Ihrldq1M3XtjuEvIUqi8W
 github.com/sagernet/reality v0.0.0-20230406110435-ee17307e7691 h1:5Th31OC6yj8byLGkEnIYp6grlXfo1QYUfiYFGjewIdc=
 github.com/sagernet/reality v0.0.0-20230406110435-ee17307e7691/go.mod h1:B8lp4WkQ1PwNnrVMM6KyuFR20pU8jYBD+A4EhJovEXU=
 github.com/sagernet/sing v0.6.7/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
-github.com/sagernet/sing v0.6.8-0.20250429070844-b63643251ed5 h1:j5r2x3Lazb1giycHFxICc201LSyDn3ZH+ywa+8duNxo=
-github.com/sagernet/sing v0.6.8-0.20250429070844-b63643251ed5/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
+github.com/sagernet/sing v0.6.8 h1:rpi0MozOxq2xD2/sAqXJDaoxLOvGU+foBs1a6HsYErg=
+github.com/sagernet/sing v0.6.8/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
 github.com/sagernet/sing-dns v0.4.2 h1:cWe2XPUBFLep2j9kJV4Epg3bctGhMvrrl/sWi9Wszfg=
 github.com/sagernet/sing-dns v0.4.2/go.mod h1:dweQs54ng2YGzoJfz+F9dGuDNdP5pJ3PLeggnK5VWc8=
 github.com/sagernet/sing-mux v0.3.2 h1:meZVFiiStvHThb/trcpAkCrmtJOuItG5Dzl1RRP5/NE=