docs: update platform version requirements for Qt 6.10.3

[DonLakeFlyer]

Changes

• macOS: Update minimum from macOS 12 (Monterey) to macOS 13 (Ventura) to match Qt 6.10.3 requirements.
• Android: Remove upper OS bound (was "9 to 15"), now "Android 9 (API 28) or later" since Android apps are forward-compatible.
• Android: Add important note that Qt 6.10.3 makes Android 9 the hard minimum, meaning integrated controllers on older Android versions are no longer supported. QGroundControl 5.0 stable is the last release for those devices.

[Copilot]

Pull request overview

Documentation-only update bumping the macOS minimum requirement and clarifying Android support to align with Qt 6.10.3.

Changes:

• Update macOS minimum from 12 (Monterey) to 13 (Ventura).
• Replace Android "9 to 15" range with "9 (API 28) or later".
• Add an important note explaining Android 9 is now a hard floor and that QGC 5.0 stable is the last release for older devices.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 25.57%. Comparing base (f29efd3) to head (7d271b7).
⚠️ Report is 13 commits behind head on master.

❌ Your project check has failed because the head coverage (25.57%) is below the target coverage (30.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #14398      +/-   ##
==========================================
+ Coverage   25.47%   25.57%   +0.10%     
==========================================
  Files         769      769              
  Lines       65912    66244     +332     
  Branches    30495    30640     +145     
==========================================
+ Hits        16788    16941     +153     
+ Misses      37285    37279       -6     
- Partials    11839    12024     +185     

Flag	Coverage Δ
unittests	25.57% <ø> (+0.10%)	⬆️

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see 24 files with indirect coverage changes

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[github-actions]

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