chore(deps): ⬆️ bump actions/checkout from v4 to v6 in gleam new command #11377

Job	Run time
validate	18s
lint-build	55s
rustfmt	16s
test-wasm	1m 37s
test (stable, x86_64-unknown-linux-gnu)	4m 19s
test (stable, aarch64-unknown-linux-musl)	4m 15s
test (stable, aarch64-apple-darwin, macos-latest, arm64, cargo, true)	5m 38s
test (stable, aarch64-unknown-linux-gnu)	3m 39s
test (stable, x86_64-unknown-linux-musl)	6m 18s
test (stable, x86_64-apple-darwin)	7m 48s
test (stable, x86_64-pc-windows-msvc)	5m 41s
test-projects	2m 51s
	43m 35s

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