Revert "Retract v1.12.0"

This reverts commit bd381f0.

Author: oschwald

go.mod

@@ -2,10 +2,6 @@ module github.com/oschwald/geoip2-golang/v2
 
 go 1.24
 
-retract (
-	v1.12.0 // pointed to v2 changes
-)
-
 require (
 	github.com/oschwald/maxminddb-golang/v2 v2.0.0-beta.7
 	github.com/stretchr/testify v1.10.0