Stop using S3 CocoaPods Specs mirror (#30265)
Stop using S3 CocoaPods Specs mirror (#30265)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/30265

The CocoaPods Specs mirror provided by Circle CI is no longer supported, and is no longer necessary, as of CocoaPods v1.8. We are already using the CDN in the Podfile, so the step may be removed from the Circle CI config.

Reference: https://circleci.com/docs/2.0/testing-ios/#optimizing-cocoapods
Changelog: [Internal]

Reviewed By: fkgozali

Differential Revision: D24601585

fbshipit-source-id: c794102cf573e0cf47ae936bf3c1eb386e089315

facebook/react-native,arthuralee/react-native,arthuralee/react-native,myntra/react-native,myntra/react-native,javache/react-native,myntra/react-native,javache/react-native,facebook/react-native,facebook/react-native,arthuralee/react-native,facebook/react-native,janicduplessis/react-native,facebook/react-native,pandiaraj44/react-native,janicduplessis/react-native,javache/react-native,myntra/react-native,janicduplessis/react-native,janicduplessis/react-native,pandiaraj44/react-native,facebook/react-native,janicduplessis/react-native,pandiaraj44/react-native,javache/react-native,myntra/react-native,javache/react-native,arthuralee/react-native,javache/react-native,javache/react-native,janicduplessis/react-native,pandiaraj44/react-native,pandiaraj44/react-native,myntra/react-native,facebook/react-native,facebook/react-native,facebook/react-native,arthuralee/react-native,myntra/react-native,myntra/react-native,javache/react-native,janicduplessis/react-native,pandiaraj44/react-native,pandiaraj44/react-native,pandiaraj44/react-native,javache/react-native,myntra/react-native,janicduplessis/react-native