Libs(Go): add retractions for accidentally published test versions (#1612)

Some tags got pushed (from a fork) into the main OSS repo, causing
problems for the Go package tooling once the tags had been removed.

These retractions should tell the packager that these versions should
not be depended on.

Author: svix-onelson

go.mod

@@ -2,6 +2,19 @@ module github.com/svix/svix-webhooks
 
 go 1.20
 
+retract (
+	v1.46.0
+	v1.47.0
+	v1.48.0
+	v1.49.0
+	v1.50.0
+	v1.51.0
+	v1.52.0
+	// v1.53.0 was never published
+	v1.54.0
+	v1.55.0
+)
+
 require (
 	golang.org/x/oauth2 v0.0.0-20210514164344-f6687ab2804c
 	gopkg.in/validator.v2 v2.0.1