Describe the bug
Hello,

regarding the Apple Privacy Manifest file, I noticed that the PrivacyInfo file was added to AppAuth to be compliant with the new guidelines; however, when I try to generate a privacy report for my app including AppAuth through xCode I receive the following errors:

Missing an expected key: 'NSPrivacyCollectedDataType'
Missing an expected key: 'NSPrivacyCollectedDataType'

To Reproduce
Steps to reproduce the behaviour:

1. Include AppAuth package dependency in the app
2. generate the archive in xCode Product->archive
3. open the xCode organizer
4. right click on the archive version number and press 'Generate privacy report'
5. open the archived report PDF and observe