Update dependency i18next-http-backend to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
i18next-http-backend	^3.0.2 → ^4.0.0

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Release Notes

i18next/i18next-http-backend (i18next-http-backend)

v4.0.0

Compare Source

• BREAKING: drop cross-fetch dependency. i18next-http-backend now requires a host-provided fetch. This is available in Node ≥ 18 (stable since Node 21), all modern browsers, Deno, and Bun. For runtimes without native fetch, install a ponyfill yourself and inject it via options.alternateFetch, or stay on v3.x.
• BREAKING: minimum Node version is now 18 (engines.node = ">=18").
• chore: simplified environment detection in lib/request.js — uses globalThis (with global / window fallbacks for legacy embedded runtimes) instead of separate global.* / window.* branches per API. XHR / ActiveXObject are still picked up if the host provides them, but no longer polyfilled.
• chore: declared "sideEffects": false for better tree-shaking by downstream bundlers.
• build: replaced babel + browserify + uglify-js with tsdown (rolldown + oxc). One config produces ESM, CJS, and the IIFE browser bundles. Drops @babel/cli, @babel/core, @babel/preset-env, babel-plugin-add-module-exports, browserify, uglify-js, the fixcjs rewrite hack, and the --ignore cross-fetch browserify flag. Side benefit: minified browser bundle shrinks from ~13 KB to ~6.8 KB (oxc minifier + no babel runtime helpers).
• build: ESM and CJS outputs are now bundled into a single index.js per format (previously one file per lib/*.js module). The package's exports map is unchanged, so this is invisible to consumers using documented entry points.
• lint: replaced eslint-config-standard (+ five plugins) with neostandard and migrated to ESLint 9 flat config (eslint.config.mjs). Removed deprecated tslint and dtslint — test:typescript now runs tsc --noEmit plus tsd.
• chore: tightened .npmignore — published tarball no longer includes the source lib/, the build configs (tsdown.config.ts, eslint.config.mjs, tsconfig.json), or the root index.js re-export shim. Drops from 21.3 KB → ~17 KB packed.
• docs: alternateFetch is now documented in the README options block as the supported escape hatch for fetch ponyfills, test mocking, and request interception. v4 migration note added to "Getting started".

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