ci: refactor to work with both node v20+22

.retrofit-pkg-json.js

@@ -1,6 +1,12 @@
 // transmogrifying wdi5's package.json to a cjs version
 import { promises as fs } from "fs"
-import pkgJson from "./package.json" assert { type: "json" }
+import { readFileSync } from "fs"
+import { dirname, join } from "node:path"
+import { fileURLToPath } from "node:url"
+
+const pkgJsonPath = join(dirname(fileURLToPath(import.meta.url)), "./package.json")
+const pkgJson = JSON.parse(readFileSync(pkgJsonPath, "utf8"))
+
 ;["type", "exports", "types", "files", "workspaces", "scripts", "lint-staged"].forEach((section) => {
     delete pkgJson[section]
 })