Update to Gleam 1.2.0 #39

Job	Run time
lint-build	44s
rustfmt	6s
test-flake (x86_64-unknown-linux-gnu)	1m 12s
test (stable, x86_64-unknown-linux-gnu)	4m 53s
test-flake (x86_64-unknown-linux-musl)	1m 15s
test-wasm	1m 25s
test (stable, x86_64-unknown-linux-musl)	5m 12s
test-flake (aarch64-unknown-linux-musl)	1m 11s
test (stable, aarch64-unknown-linux-gnu)	12s
test-flake (x86_64-apple-darwin)	2m 40s
test (stable, aarch64-unknown-linux-musl)	4m 27s
test-flake (aarch64-apple-darwin, macos-14)	2m 2s
test (stable, x86_64-apple-darwin)	5m 0s
test (stable, x86_64-pc-windows-msvc)	5m 0s
test (stable, aarch64-apple-darwin, macos-14, false, true, true)	4m 52s
test-projects	1m 51s
	42m 2s

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