ci: limit only iOS+Android flet_example matrices to 3.12 (msgpack whe… #224

Job	Run time
Test on iOS (Python 3.12)	5m 9s
Test on Windows (Python 3.12)	4m 21s
Test on macOS (Python 3.12)	2m 36s
Test on macOS (Python 3.14)	3m 44s
Bridge example Windows round-trip (Python 3.14)	2m 58s
Test on Windows (Python 3.14)	15s
Test on Linux AMD64 (Python 3.14)	3m 4s
Test on Linux ARM64 (Python 3.14)	2m 45s
Bridge example iOS round-trip (Python 3.12)	3m 21s
Bridge example Linux round-trip (Python 3.14)	1m 53s
Test on macOS (Python 3.13)	3m 10s
Test on Linux ARM64 (Python 3.12)	2m 31s
Bridge example iOS round-trip (Python 3.14)	4m 54s
Test on Windows (Python 3.13)	4m 31s
Bridge example Windows round-trip (Python 3.13)	3m 30s
Bridge example Linux round-trip (Python 3.12)	2m 18s
Bridge example macOS round-trip (Python 3.12)	1m 26s
Bridge example Android round-trip (Python 3.13)	4m 26s
Bridge example Windows round-trip (Python 3.12)	2m 45s
Bridge example Linux round-trip (Python 3.13)	2m 15s
Bridge example Android round-trip (Python 3.14)	4m 25s
Test on Linux AMD64 (Python 3.13)	2m 47s
Test on Android (Python 3.12)	2m 31s
Bridge example macOS round-trip (Python 3.13)	49s
Test on Linux ARM64 (Python 3.13)	2m 27s
Bridge example Linux round-trip (Python 3.12)	2m 19s
Bridge example macOS round-trip (Python 3.14)	4m 25s
Bridge example iOS round-trip (Python 3.13)	4m 25s
Test on Linux AMD64 (Python 3.12)	2m 18s
Bridge example Android round-trip (Python 3.12)	1m 54s
Bridge example Linux round-trip (Python 3.13)	2m 1s
Bridge example Linux round-trip (Python 3.14)	2m 0s
Publish to pub.dev	1s
	1h 34m 14s

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