Update to Gleam 1.2.0 #42

Job	Run time
test-flake (x86_64-unknown-linux-gnu)	10m 4s
test-flake (x86_64-unknown-linux-musl)	10m 42s
test (stable, x86_64-unknown-linux-gnu)	4m 35s
test-flake (aarch64-unknown-linux-musl)	10m 4s
test (stable, x86_64-unknown-linux-musl)	6m 34s
lint-build	42s
test (stable, aarch64-unknown-linux-gnu)	1m 55s
rustfmt	6s
test-flake (x86_64-apple-darwin)	11m 3s
test (stable, aarch64-unknown-linux-musl)	4m 7s
test-flake (aarch64-apple-darwin, macos-14)	7m 39s
test (stable, x86_64-apple-darwin)	7m 30s
test-wasm	1m 10s
test (stable, x86_64-pc-windows-msvc)	9m 32s
test (stable, aarch64-apple-darwin, macos-14, false, true, true)	4m 52s
test-projects	1m 38s
	1h 32m 13s

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