Resolve master specs repo warning shown in pod install

[noway]

Summary:

Fix for #48627

Changelog:

[IOS] [FIXED] - Resolve "Your project does not explicitly specify the CocoaPods master specs repo" pod install warning

Test Plan:

1. Run bundle exec pod install
2. Observe the warning no longer showing

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@fabriziocucci has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@fabriziocucci merged this pull request in 2f22817.

[react-native-bot]

This pull request was successfully merged by @noway in 2f22817

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