Bump actions/setup-python from 5 to 6 #769

Job	Run time
clippy	2m 8s
wasm	1m 48s
fmt	7s
swift_build_xcframework	15m 24s
android_simulator_tests	8m 15s
apple_simulator_tests (stable, aarch64-apple-ios-sim, iPhone 16)	18m 43s
apple_simulator_tests (aarch64-apple-watchos-sim, Apple Watch Ultra 2 (49mm), -Zbuild-std, nightly)	16m 17s
integration_tests	10m 53s
kotiln_integration_tests (macos-15)	21m 40s
apple_simulator_tests (aarch64-apple-tvos-sim, Apple TV 4K (3rd generation), -Zbuild-std, nightly)	14m 28s
kotiln_integration_tests (ubuntu-24.04)	14m 17s
typos	6s
swift_integration_tests (package)	5m 41s
swift_integration_tests (macos)	2m 51s
swift_integration_tests (visionos)	12m 50s
swift_integration_tests (watchos)	8m 41s
swift_integration_tests (ios)	5m 57s
swift_integration_tests (tvos)	6m 35s
coverage_report	-1s
	2h 46m 40s

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