Increase max-old-space-size for builds (elastic#42218)

Signed-off-by: Tyler Smalley <[email protected]>

Author: Tyler Smalley

src/dev/build/tasks/optimize_task.js

@@ -49,7 +49,7 @@ export const OptimizeBuildTask = {
       env: {
         FORCE_DLL_CREATION: 'true',
         KBN_CACHE_LOADER_WRITABLE: 'true',
-        NODE_OPTIONS: '--max-old-space-size=2048'
+        NODE_OPTIONS: '--max-old-space-size=3072'
       },
     });