chore: bump swift version in the podspec

AlgoliaSearchClient.podspec

@@ -8,7 +8,7 @@ Pod::Spec.new do |spec|
   spec.author       = { 'Algolia' => '[email protected]'  }
   spec.documentation_url = "https://www.algolia.com/doc/api-client/getting-started/what-is-the-api-client/swift/"
   spec.platforms = { :ios => "14.0", :osx => "11.0", :watchos => "7.0", :tvos => "14.0" }
-  spec.swift_version = "5.1"
+  spec.swift_version = "5.8"
   spec.source = { :git => "https://github.com/algolia/algoliasearch-client-swift.git", :tag => spec.version }
   spec.source_files  = "Sources/AlgoliaSearchClient/**/*.swift"
 end