all: release v1.36.4

Change-Id: I0982b0714f2f250df0db242d6300cb5f44d999bf
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/643956
Reviewed-by: Chressie Himpel <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: stapelberg

internal/version/version.go

@@ -52,8 +52,8 @@ import (
 const (
 	Major      = 1
 	Minor      = 36
-	Patch      = 3
-	PreRelease = "devel"
+	Patch      = 4
+	PreRelease = ""
 )
 
 // String formats the version string for this module in semver format.