Bump actions/checkout from 5 to 6 #10607

Job	Run time
Check MSRV	2m 56s
Test Suite	6m 42s
Test Suite with Optimizations	6m 56s
Clippy	4m 44s
Docs	5m 23s
matrix_test (aarch64-apple-ios, macos-latest, 1.88.0, false, build, --package dioxus-desktop, ios)	1m 7s
matrix_test (aarch64-linux-android, blacksmith-4vcpu-ubuntu-2404, 1.88.0, true, build, --package ...	2m 28s
Test Docs	6m 0s
Rustfmt	37s
matrix_test (aarch64-apple-darwin, macos-latest, 1.88.0, false, test, --all --tests, desktop)	7m 42s
nix (blacksmith-4vcpu-ubuntu-2404)	40s
matrix_test (aarch64-unknown-linux-gnu, ubuntu-24.04-arm, 1.88.0, false, build, --all --tests, de...	10m 57s
Playwright Tests (blacksmith-8vcpu-ubuntu-2404, beta)	4m 24s
Playwright Tests (windows-latest, beta)	10m 29s
nix (macos-latest)	23s
Check	4m 33s
cargo test \| windows	11m 33s
	1h 27m 34s

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