Suppress warning for deprecated value .

[richy486]

What does this PR do? Suppress warning for deprecated value subscriberCellularProvider.

Where should the reviewer start? PostHog/Internal/PHGPostHogIntegration.m

How should this be manually tested?

Any background context you want to provide? I was getting a warning in iOS 16

What are the relevant tickets? no

Screenshots or screencasts (if UI/UX change) none

Questions:

• Does the docs need an update? no
• Are there any security concerns?
• Do we need to update engineering / success? no

[marandaneto]

Closed because of the new major version that does not use this provider anymore https://github.com/PostHog/posthog-ios/pull/75