Update minimum cocoapods deployment_target to 9.0

Author: yaroslavyaroslav

web3swift.podspec

@@ -2,7 +2,7 @@ Pod::Spec.new do |spec|
     spec.name         = 'web3swift'
     spec.version      = '2.5.0'
     spec.ios.deployment_target = "9.0"
-    spec.osx.deployment_target = "10.11"
+    spec.osx.deployment_target = "10.12"
     spec.license      = { :type => 'Apache License 2.0', :file => 'LICENSE.md' }
     spec.summary      = 'Web3 implementation in vanilla Swift for iOS, macOS, and Linux'
     spec.homepage     = 'https://github.com/matter-labs/web3swift'