OHHTPStubs frameworks: Put Headers phase before Sources phase.

[byohay]

Checklist

• [ X ] I've checked that all new and existing tests pass
• [ X ] I've updated the documentation if necessary
• [ X ] I've added an entry in the CHANGELOG to credit myself

Motivation and Context

On Xcode 13.3 sometimes an error about cycle dependencies is emitted. The fix to this is to put the Headers build phase before Sources build phase.

[shredsonic]

We also need this fix merged in.