fix(gomod): another rethinkdb/rethinkdb-go.v5 exception

lib/manager/gomod/update.js

@@ -9,7 +9,10 @@ function updateDependency(currentFileContent, upgrade) {
     logger.debug(`gomod.updateDependency: ${upgrade.newValue}`);
     const lines = currentFileContent.split('\n');
     const lineToChange = lines[upgrade.lineNumber];
-    if (!lineToChange.includes(upgrade.depName)) {
+    if (
+      !lineToChange.includes(upgrade.depName) &&
+      !lineToChange.includes('rethinkdb/rethinkdb-go.v5')
+    ) {
       return null;
     }
     let requireLine;