Remove dependency on CGO

This commit changes the SQLite dependency to one that does not depend on
CGO. It uses a C-to-Go translated sqlite library that is Pure go.

db.go

@@ -3,8 +3,8 @@ package headscale
 import (
 	"errors"
 
+	"github.com/glebarez/sqlite"
 	"gorm.io/driver/postgres"
-	"gorm.io/driver/sqlite"
 	"gorm.io/gorm"
 	"gorm.io/gorm/logger"
 )