Update Parse.podspec With newer version of Facebook SDK

[adammlevy]

Upate FacebookSDK to 11.2.1

New Pull Request Checklist

• [X ] I am not disclosing a vulnerability.
• [ ] I am creating this PR in reference to an issue.

Issue Description

Updates the Facebook SDK Related issue: #FILL_THIS_OUT

Approach

TODOs before merging

• [ ] Add tests
• [ ] Add entry to changelog
• [ ] Add changes to documentation (guides, repository pages, in-code descriptions)

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[mtrezza]

Closing, Cocoapods is not longer supported due to SPM support; FB SDK has been upgraded