Update version to 1.8.4

The changes include:
- Bump version from 1.8.3 to 1.8.4 in the podspec
- Update social media URL in podspec
- Increase MARKETING_VERSION to 1.8.4 in the shared Xcode config

CryptoSwift.podspec

@@ -1,13 +1,13 @@
 Pod::Spec.new do |s|
   s.name         = "CryptoSwift"
-  s.version      = "1.8.3"
+  s.version      = "1.8.4"
   s.source       = { :git => "https://github.com/krzyzanowskim/CryptoSwift.git", :tag => "#{s.version}" }
   s.summary      = "Cryptography in Swift. SHA, MD5, CRC, PBKDF, Poly1305, HMAC, CMAC, HDKF, Scrypt, ChaCha20, Rabbit, Blowfish, AES, RSA."
   s.description  = "Cryptography functions and helpers for Swift implemented in Swift. SHA-1, SHA-2, SHA-3, MD5, PBKDF1, PBKDF2, Scrypt, CRC, Poly1305, HMAC, ChaCha20, Rabbit, Blowfish, AES, RSA"
   s.homepage     = "https://github.com/krzyzanowskim/CryptoSwift"
   s.license      = {:type => "Attribution", :file => "LICENSE"}
   s.authors      = {'Marcin Krzyżanowski' => 'marcin@krzyzanowskim.com'}
-  s.social_media_url = "https://twitter.com/krzyzanowskim"
+  s.social_media_url = "https://x.com/krzyzanowskim"
   s.cocoapods_version = '>= 1.10.0'
   s.swift_version = "5.6"
   s.ios.deployment_target = "11.0"

config/Project-Shared.xcconfig

@@ -1,4 +1,4 @@
-MARKETING_VERSION = 1.8.3
+MARKETING_VERSION = 1.8.4
 
 SUPPORTED_PLATFORMS = iphonesimulator iphoneos macosx appletvos watchos appletvsimulator watchsimulator xrsimulator xros