chore(ios): modify podspec file for cocoapods integration

[ozonelmy]

Pre-PR Checklist

• [x] I added/updated relevant documentation.
• [x] I followed the Convention Commit guideline with maximum 72 characters to submit commit message.
• [x] I squashed the repeated code commits.
• [x] I signed the [CLA].
• [x] I added/updated test cases to check the change I am making.
• [x] All existing and new tests are passing.

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[hippy-service[bot]]

:tada: It seems that this pull request has been approved by all required reviewers. But it has more than one normal commit, I will notify admin team member to merge it manually, please wait a moment.