Remove IPHONEOS_DEPLOYMENT_TARGET warning by upgrading iOS to 9

[minuscorp]

No description provided.

[CemYil03]

#661 already covers this.

[minuscorp]

Still not merged though

[Oliver-Binns]

#661 is a better implementation of this. It would be preferable to merge that instead.

The platform declarations can be removed entirely as they match the minimum version supported by SPM:
https://forums.swift.org/t/xcode12-minimum-deployment-target-and-spm/40467
https://github.com/nanopb/nanopb/pull/585/files

[minuscorp]

I saw it, and saw that it wasn't reviewed that's why I posted another one. I really hate warnings in projects.

[mattneub]

Please merge this change! We need to get this warning off our plate.

[petea]

This was addressed in #690 and released with 1.5.0. What warning are you seeing?

[mattneub]

Yes, I just realized that. The problem is that AppAuth is an indirect dependency so I'm not certain that the version we get is up to us. We're looking into it! Thanks.