Update to Gleam 1.2.0 #40

Job	Run time
rustfmt	5s
lint-build	44s
test-flake (x86_64-unknown-linux-gnu)	10m 40s
test (stable, x86_64-unknown-linux-gnu)	3m 0s
test-flake (x86_64-unknown-linux-musl)	10m 24s
test (stable, x86_64-unknown-linux-musl)	6m 19s
test-wasm	1m 9s
test-flake (aarch64-unknown-linux-musl)	10m 28s
test (stable, aarch64-unknown-linux-gnu)	3m 41s
test-flake (x86_64-apple-darwin)	12m 24s
test (stable, aarch64-unknown-linux-musl)	2m 21s
test-flake (aarch64-apple-darwin, macos-14)	7m 20s
test (stable, x86_64-apple-darwin)	10m 40s
test (stable, x86_64-pc-windows-msvc)	7m 55s
test (stable, aarch64-apple-darwin, macos-14, false, true, true)	3m 10s
test-projects	1m 35s
	1h 31m 55s

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