Update minimum iOS version

[a-maurice]

Description

Provide details of the change, and generalize the change in the PR title above.

Update the minimum iOS version to 15.0. This is needed since the Firebase iOS dependencies have updated their minimum to 15.

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Testing

Describe how you've tested these changes.

https://github.com/firebase/firebase-unity-sdk/actions/runs/16358032875

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Type of Change

Place an x the applicable box:

• Bug fix. Add the issue # below if applicable.
• New feature. A non-breaking change which adds functionality.
• Other, such as a build process or documentation change.

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[gemini-code-assist]

Summary of Changes

Hello @a-maurice, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the project's minimum iOS and tvOS deployment targets to 15.0. This is a necessary change to maintain compatibility with recent Firebase iOS dependency updates. The changes involve modifying various project settings files for test applications, updating CMake build configurations, and documenting the new requirement.

Highlights

• Minimum iOS Version Update: The minimum iOS deployment target has been updated from 13.0 to 15.0 across various test applications and build configurations. This change is driven by updated minimum version requirements from Firebase iOS dependencies.
• Build Configuration Alignment: The DEFAULT_MIN_TARGET_SDK in the CMake configuration for play services resolver dependencies has been updated to 15.0 to reflect the new minimum iOS version.
• Documentation Update: The readme.md file has been updated to include a note in the 'Upcoming Changes' section, explicitly stating that the minimum iOS deployment target is now 15.0.

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[gemini-code-assist]

Code Review

This pull request updates the minimum iOS deployment target to 15.0 across various configuration files. There are also updates to the tvOS deployment target in some files, but not all. The release notes and the xcode project file should be updated to reflect this.