blog: Deprecation of cocoapods for opentelemetry-swift

### Blog Post Title CocoaPods Deprecation Notice for OpenTelemetry Swift ### Blog Post Outline Discusses the current state of cocoapods and why we will no longer support it in the future. Outline: 1. Summary 2. Why are we making this change? 3. Timeline 4. What does this mean for existing users? 5. Recommended Migration Path 6. Feedback ### Technologies Used - Swift Package Manager - cocoapods - Swift ### Related Special Interest Groups (SIGs) - SIG Swift ### Sponsoring SIG SIG Swift ### Sponsor Name @nachoBonafonte, @ArielDemarco, @bryce-b ### Additional Information _No response_