Prepare for npm v12

Author: myovchev

.changeset/grumpy-beers-beam.md

@@ -0,0 +1,5 @@
+---
+"@apostrophecms/import-export-xlsx": minor
+---
+
+Replaced the off-registry SheetJS `xlsx` tarball dependency with the registry-published `@e965/xlsx` mirror, which exposes the same SheetJS Community Edition API. The module now installs entirely from the npm registry, avoiding install failures on networks restricted to the registry and the npm v12 restriction on non-registry (remote tarball) sources.

packages/import-export-xlsx/README.md

@@ -17,9 +17,9 @@
 
 This module improves [@apostrophecms/import-export](https://github.com/apostrophecms/import-export) by adding the `xlsx` format.
 
-> Why does this specific format lies in another module?
+> Why does this specific format live in another module?
 
-Because it relies on a [dependency that is not hosted on NPM](https://github.com/SheetJS/sheetjs/issues/2667), which could lead to installation issues on networks that limit connections to NPM repository only.
+Historically because it relied on a [dependency that was not hosted on NPM](https://github.com/SheetJS/sheetjs/issues/2667). It now depends on [`@e965/xlsx`](https://www.npmjs.com/package/@e965/xlsx), a registry-published mirror of SheetJS Community Edition with the same API, so it installs from the npm registry like any other module. The format remains in its own module for backwards compatibility.
 
 ## Requirement
 

packages/import-export-xlsx/lib/xlsx.js

@@ -1,4 +1,4 @@
-const XLSX = require('xlsx');
+const XLSX = require('@e965/xlsx');
 
 module.exports = {
   label: 'XLSX',

packages/import-export-xlsx/package.json

@@ -24,6 +24,6 @@
     "stylelint-config-apostrophe": "workspace:^"
   },
   "dependencies": {
-    "xlsx": "https://cdn.sheetjs.com/xlsx-0.20.2/xlsx-0.20.2.tgz"
+    "@e965/xlsx": "^0.20.3"
   }
 }