nostr-sdk-ios : Upgrade GitHub Actions Checkout to V4 to fix Node.js deprecation warnings (#163)
* Fix SwiftLint errors
* Upgrade GitHub Actions Checkout to V4 to fix Node.js deprecation warnings
https://github.com/nostr-sdk/nostr-sdk-ios/commit/3e3d6422917c97b79ada599d5815693a845c7758