all: release v1.27.1

Change-Id: I9acc84df59805ba789ef42ee2dc43e14ce56818b
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/331289
Trust: Joe Tsai <joetsai@digital-static.net>
Reviewed-by: Damien Neil <dneil@google.com>

Author: dsnet

internal/version/version.go

@@ -53,8 +53,8 @@ import (
 const (
 	Major      = 1
 	Minor      = 27
-	Patch      = 0
-	PreRelease = "devel"
+	Patch      = 1
+	PreRelease = ""
 )
 
 // String formats the version string for this module in semver format.