(core) Update dependencies

Summary:
Changes the minimum version of Node to 18, and updates the Docker images and GitHub workflows to build Grist with Node 18.

Also updates various dependencies and scripts to support building running tests with arm64 builds of Node.

Test Plan: Existing tests.

Reviewers: paulfitz

Reviewed By: paulfitz

Differential Revision: https://phab.getgrist.com/D3968

app/client/ui/CustomSectionConfig.ts

@@ -628,6 +628,8 @@ export class CustomSectionConfig extends Disposable {
   protected async _getWidgets() {
     const api = this._gristDoc.app.topAppModel.api;
     const widgets = await api.getWidgets();
+    if (this.isDisposed()) { return; }
+
     // Request for rest of the widgets.
     if (this._canSelect) {
       // From the start we will provide single widget definition