fix(swift5): upgrade deployment target to fix cocoapods deployment #1554

Job	Run time
get_available_profiles	3s
update_client_pr (android-uploader, api.video-android-uploader)	38s
merge_client_pr	0s
update_client_pr (android, api.video-android-client)	38s
close_client_pr	0s
update_client_pr (csharp, api.video-csharp-client)	18s
update_client_pr (go, api.video-go-client)	17s
update_client_pr (java, api.video-java-client)	41s
update_client_pr (nodejs, api.video-nodejs-client)	43s
update_client_pr (php, api.video-php-client)	17s
update_client_pr (python, api.video-python-client)	27s
update_client_pr (swift5-uploader, api.video-swift-uploader)	32s
update_client_pr (swift5, api.video-swift-client)	1m 0s
generate_documentation	8s
	5m 42s

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