fix: sets static builds in core podspec to prevent dependency conflicts

[younes0]

This PR configures RNMLKitCore.podspec to use static builds to prevent dependency conflicts See: https://github.com/infinitered/react-native-mlkit/issues/169

Why

• Prevents dependency conflicts when used alongside other libraries (like React Native Firebase)
• Follows CocoaPods best practices for React Native modules

Impact

• No negative impact on existing implementations
• Helps prevent version conflicts with shared dependencies (like nanopb)
• Minimal change that follows standard CocoaPods patterns

Testing

• [x] Tested with React Native Firebase
• [x] Verified basic MLKit functionality

[changeset-bot[bot]]

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Latest commit: 8f06f6a68bf52192fedb0013c1c0549dc0d65da1

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