allow lockfile when installing nextjs integration test deps

Author: lobsterkatie

packages/nextjs/test/run-integration-tests.sh

@@ -61,7 +61,7 @@ for NEXTJS_VERSION in 10 11 12; do
   else
     sed -i /"next.*latest"/s/latest/"${NEXTJS_VERSION}.x"/ package.json
   fi
-  yarn --no-lockfile --silent >/dev/null 2>&1
+  yarn --silent >/dev/null 2>&1
   # if applicable, use local versions of `@sentry/cli` and/or `@sentry/webpack-plugin` (these commands no-op unless
   # LINKED_CLI_REPO and/or LINKED_PLUGIN_REPO are set)
   linkcli && linkplugin