Increase ts fork check mem limit (#22118)

scripts/webpack/webpack.prod.js

@@ -90,6 +90,7 @@ module.exports = merge(common, {
   plugins: [
     new ForkTsCheckerWebpackPlugin({
       checkSyntacticErrors: true,
+      memoryLimit: 4096,
     }),
     new MiniCssExtractPlugin({
       filename: 'grafana.[name].[hash].css',