Avoid using Cocoapods 1.15 until it fixes an issue affection RN. (#42702)

Summary:
Cocoapods 1.15 (https://github.com/facebook/react-native/issues/42698) current breaks the build, limit to version >= 1.13 & < 1.15

This is currently broken and affecting users, we'll remove this limit once Cocopods fixes the regression.  It's currently blocking 0.73.3.

## Changelog:
[iOS][Fixed] don't allow cocoapods 1.15.

<!-- Help reviewers and the release process by writing your own changelog entry.

Pick one each for the category and type tags:

[ANDROID|GENERAL|IOS|INTERNAL] [BREAKING|ADDED|CHANGED|DEPRECATED|REMOVED|FIXED|SECURITY] - Message

For more details, see:
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Pull Request resolved: https://github.com/facebook/react-native/pull/42702

Test Plan:
```
bundle exec pod install
```

Reviewed By: cipolleschi

Differential Revision: D53180111

Pulled By: blakef

fbshipit-source-id: 4c5dd11db6d208e8d71249443a8f85e601913abd