show latest major version available in `gleam deps update` #8026

Job	Run time
validate	11s
test (stable, x86_64-unknown-linux-gnu)	3m 41s
rustfmt	5s
test (stable, x86_64-unknown-linux-musl)	6m 19s
lint-build	28s
test-wasm	1m 19s
test (stable, aarch64-unknown-linux-gnu)	1m 57s
test (stable, aarch64-unknown-linux-musl)	3m 0s
test (stable, x86_64-apple-darwin)	9m 44s
test (stable, x86_64-pc-windows-msvc)	6m 23s
test (stable, aarch64-apple-darwin, macos-latest, false, true)	4m 5s
test-projects	0s
	37m 12s

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