Update MobileBuyIntegration dependencies

[josemiguel-alvarez]

What are you trying to accomplish?

The sample app cannot be built due to an error in the dependencies. This PR fixes it.

How to test

Open the sample app in Xcode and build it.

Before you merge

Testing

• [ ] I've added tests to support my implementation

Contribution guidelines

• [x] I have read and agree with the Contribution Guidelines.
• [x] I have read and agree with the Code of Conduct.

Documentation

• [ ] I've updated any documentation related to these changes.
• [ ] I've updated the README.

Versioning

• [ ] I have bumped the version number in the .podspec file.
• [ ] I have bumped the version number in the README.
• [ ] I have added a Changelog entry.

After merging

If your changes required a version bump, please add an entry under the Releases page - doing so will trigger a CI workflow to publish the latest Cocoapod.