colors don't change after update()

### Expected behavior

grid colors should be taken from Chart.defaults after update() if not set

### Current behavior

colors are not updated for all elements

### Reproducible sample

https://codesandbox.io/s/vue-chart-3-chart-js-issue-template-forked-bp5dov?file=/src/App.vue

### Optional extra steps/info to reproduce

all in playground

### Possible solution

all in playground

### Context

_No response_

### chart.js version

v4.2.0

### Browser name and version

Google Chrome 109.0.5414.119

### Link to your project

_No response_