all: release v1.34.0

Change-Id: I7c2f620c393c0bc7212adb05320d57ea28d580cf
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/582455
Reviewed-by: Chressie Himpel <chressie@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Lasse Folger <lassefolger@google.com>

internal/version/version.go

@@ -51,9 +51,9 @@ import (
 //  10. Send out the CL for review and submit it.
 const (
 	Major      = 1
-	Minor      = 33
+	Minor      = 34
 	Patch      = 0
-	PreRelease = "devel"
+	PreRelease = ""
 )
 
 // String formats the version string for this module in semver format.