Bump http-proxy from 1.17.0 to 1.18.1 in /packages/mst-example-boxes (#1574)
Bump http-proxy from 1.17.0 to 1.18.1 in /packages/mst-example-boxes (#1574)

[skip ci]
mobxjs/mobx-state-tree,mobxjs/mobx-state-tree,mweststrate/mobx-state-tree,mweststrate/mobx-state-tree,mobxjs/mobx-state-tree,mobxjs/mobx-state-tree