all: release v1.36.3

Change-Id: Icf5049d5341b55c6e2660122e5abae77f571359c
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/642855
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Chressie Himpel <chressie@google.com>

internal/version/version.go

diff --git a/internal/version/version.go b/internal/version/version.go
index 1b7d10b..f5c0628 100644
--- a/internal/version/version.go
+++ b/internal/version/version.go
@@ -52,8 +52,8 @@
 const (
 	Major      = 1
 	Minor      = 36
-	Patch      = 2
-	PreRelease = "devel"
+	Patch      = 3
+	PreRelease = ""
 )
 
 // String formats the version string for this module in semver format.